Should i feel so guilty?

my sister had a baby 2 days ago(she lives in a different state) and now child services have stepped in because she's not mentally stable plus she was going to the clubs up until a week ago(i think she was still drinking and taking drugs),they said she is a suicide risk because she use to cut herself(this was a few years ago)and also she doesnt have anywhere to live.she's only 20 and is not ready for motherhood.i dont think she deserves to have her anyway.my mum wants custody but my mum had a lot of problems with my sister(sent her to live away because she couldnt handle her,was always calling the cops on her)but c.s said basically she's got bucklys.i feel guilty because i dont want her to go but iv got an 8 mth old and i definately wouldnt be able to afford it.