Would you pay for therapy for your younger sister suffering from PTSD and depression?

TES

I decided to have my sister stay with me after witnessing my mom overdose 2x and more. The places that take her insurance are completely booked and it’s Medicaid in Philadelphia. I’m afraid if I wait or get her in with a shitty practice based on her insurance, she may not have good results. Should I pay for this? It will be roughly $400 a month, I can do it . I have 3 kids to take care of on my own . I will have to be frugal but it’s important. I was thinking to ask my mom to split costs but it’s not guaranteed and should I even ask her ??? Advice