Feeling guilt

My mom hasn't really ever been a mom. There were times when I was very young that she probably tried but she has been an addict since before she even had all her children, I'm the youngest at 23 and the oldest is 31. For the last decade I've had to fend for myself full time and she was kind of in and out and usually just causing tons of stress and drama in our lives (me and my husband, and my siblings and their SO and my aunt's and even old family friends) I love her but it's incredibly difficult to have her around and if she is around it's because she needs money or a ride or something like that but now I think she and my siblings are asking her to come stay with me. I live in an RV so she would probably have to sleep on the floor or couch, I have a tiny farm I take care of and I start a new job on Monday that I'm really looking forward too. I don't have money to spare right now we are paycheck to paycheck since my husband just started a new job a few months ago he isn't getting paid a lot yet. I want to help and I still send my brother money on occasion but he isn't an addict like my mom so I don't feel bad sending him money. My mom has lived under bridges and has put herself in terrifying situations. I feel guilty for not just letting her stay here. My siblings know how it is and aren't pressuring me but I feel like I want to help anyone and everyone at the same time. My mom is and always has been bad news as much as I love her and want to give her the world I know she will use and abuse whatever is given to her. She refuses to go to shelters or rehabs and ugh idk what to do. I pray for her and the situation and as a Christian it's so hard to describe how I'm feeling when someone seems to be in need but also literally chose drugs over her kids so idk..