Your daughter legitimately believes that she’s going to suffer for eternity and has been unwell for what seems like a few years and you’re worried about college?! That should not even be in the top 10 on a priority list right now. College will be there for your daughter in a few years, but there is no guarantee that your daughter is going to be around at this rate.
Can you ask a priest for help? If she thinks she’s going to hell, then she is clearly religious and may listen to a priest or other religious official.