What would you do?

Ive has trouble conceiving and my bestfriend of twelve years asked if I could adopt her daughter she is pregnant with in December but then blocked me once I flew her and her children back home.

So today my little sister (in high school) comes to me and says that one of her bestfriends is about five months pregnant and hasn’t told her mom (because she would be looked down upon in her culture.) She just received the Buffett Scholarship (we live in Nebraska) and has a full ride to school. She doesn’t want the baby and the baby’s dad says it isn’t his. My sister said her and her friend were talking and they wanted to know if I could adopt the baby so she could live out her dreams of school and career. I don’t know how to even respond. Advice ladies?