Girlfriend's mother on the verge of homelessness

My girlfriend called me while she was at work, asking if her mother and little sister could live with us. This is completely stressful for me on so many levels. Here's my issues with the situation: - Her mother recently won a settlement and received about $5000, which is completely gone after 2 months. She spent it on a smart phone and her daugther's $1500 camera. - She seems to always be on facebook posting statuses instead of looking for an actual job. - My girlfriend and I live in a 2 bedroom apartment. Her and I are in one room and our roomate is in the other. This is going to be more than just a tight squeeze and it's going to be completely uncomfortable and stressful. - My girlfriend wont give me an exact estimate as to how long she will be here. She says a few weeks until she finds a job in Arizona. We currently live in California. This doesn't seem likely and I'm concerned "a few weeks" is going to turn into a few months. - My girlfriend gets really frustrated thinking I'm being rude and selfish. She said if it was my family I would do it in a heart beat. In my head, I keep thinking "my parents wouldn't waste $5000 in 2 months". She also says that I shouldn't complain because she had to live with my family before we got an apartment. I reminded her that she moved in with my family because she was in a gang house and we wanted her to be in a safer environment. Am I rude, cold hearted and selfish for not wanting her mother here? Don't get me wrong I have a strong heart. I wouldn't wish that situation on anybody. I wouldn't even mind her little sister coming to stay with us because it's not that poor girl's fault. But I feel like her mother put herself in that situation and its her responsiblity. Plus, she wants to me tell our roomate. How do you explain that? I feel like her mother here will completely ruin our relationship and it will break us up. We have been together two and a half years. What should I do? Am I being selfish and mean here? Please...I need help!!!

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