Giving Her the Cold Shoulder

It really makes me angry and hurt when I have one of my friends tell me how excited she is to see me and my daughter and can't wait for us to hang out and go to the mall and do other things, an then once I arrive, she turns around and act completely different and standoffish.
I mean I have been back in Cali for almost a month with my daughter so my family and friends can see me and Sarah. Mostly to have family finally meet Sarah in person since I gave birth to her in Germany. Sarah, my husband and I wont be back in the states until sometime in November.
My one friend who has been living with my family for six months and still has yet to pay my family any rent money, but will be getting evicted on April 3rd, told me she was really excited about me coming back to Cali and that she couldn't wait for us to hang out and do things together.
I haven't done anything with her since arriving here 3 weeks ago!! The whole time I have been here, she has been standoffish to me and will only talk to me when it has something to do with her and whatever drama comes her way. I've asked her a few times if she wanted to go with me somewhere like the store or mall and every time she says no or doesn't want to be tempted to buy something when she has no money to spend.
Aside from her going to class every Monday to Thursday unless my mom can't give her a ride to the buss stop, she gets in her pj's which she will wear for a week straight and get on the computer for the rest of the day and evening talking to her Wheel of Time Guild! I would have been staying in my room with my daughter while I am here, but she has too much junk in my room that it's ridiculous! So I sleep on an air mattress in the living room. Her junk is piled all along my bedroom walls and stop just short right under my window sills!
She has made no attempt to ask me if I want to do something with her at all and hardly talks to me. So I am fed up with her and have basically been giving her the cold shoulder and I do mean cold. I basically live like she doesn't exist in my parents home and I wont let her do anything with my daughter because she is an irresponsible person and dimwit when it comes to common sense. She went into the kitchen where my mom was one night (I was taking a shower) and placed Sarah on the dirty kitchen floor that has yet to be cleaned and is where the dogs pee and poop! On another day, right after I changed her, I asked my friend, Nancy to watch Sarah for me while I went into the garage to dispose of the dirty diaper and when I came back I found my daughter crawling on pee pee pads while Nancy was on her laptop talking to her guild friends!!
Her answer to me was "oh I'm sorry. She was right in front of me a few seconds ago." Another day I was going to feed my daughter, but i had to use the restroom and Nancy heard me tell my daughter that I would feed her when I got out. I come out of the restroom and there she is feeding Sarah! So whenever she tries to play with Sarah or try to hold her, I will stop her and grab Sarah away from her. I also wont let my daughter play with Nancy's kids old toys because they are not clean.
She'll blow raspberries at Sarah and will get spit on her face which makes me mad because she hardly brushes her teeth, will shower every 3-4 days, doesn't put deodorant on, doesn't shave, doesn't bleach her mustache which is very visible or pluck her chin hairs which are also very visable yet thinks she is the most beautiful woman on earth. NOT!!!!
She's slowly starting to realize that I am ignoring and not acknowledging her because last night she would walk out into the livingroom into the kitchen and would look at me as she walked by. She would also purposly stand close to me to see if I would look and even took my dog that I left wth my parents because he's old into my room to see if I would go in there so she could talk to me but I didn't and she put my dog back in the living room.
Now normally I am not one to be cold hearted, but I am sick and tired of dealing with her crap and how everything has to be about her and the drama she brings. I'm mad that she hasn't paid my famly the rent money espesially how she says that we are like her second family and then pulls that crap on my parents. She also lied to my face about a conversation with my dad and when I asked my dad, he said that it never happened. Of course I am going to believe my father over her. I'm tired of her using the feel sorry card so people will give her what she wants.
She's a 34 year old who doesn't have a stable life, doesn't have custody of her three kids, can' figure out what she wants to do with life, yet wants to have all of these designer celebrity things. She also goes through men like dollar bills and has had 2 failed marriages. She married a 21 year old who wants out of the marriage and she's seeing a 23 year old marine who has it in his head that she is the most beautiful thing on earth and wants her to marry him in about 6 years though they have yet to meet in person! He'll dump her as soon as he sees the really bad eper that she has and how she always has to blame others and how nothing is ever her fault.
Plus she wont wait that long for him since she gets bored with guys real easy or when they get low on money. So I'm not sorry for sounding like a cold hearted person because I am at my limit with her and am just waiting for her to make that one big mistake with me so that I have a good reason to let my claws come out.
I can be very nasty when I have to be and can really hit below the belt wth someone that it would make any military man blush and head for the hills.