The federal student loans are availalbe to anyone who is eligible to file the FAFSA. If your daughter is a US citizen, a legal permanent resident alien (green card status), or falls into one of the other special categories (asylee, refugee, etc.) she can file the FAFSA. She would have needed parental information up to age 24, so maybe that is why your family never filed with her. She is now well past that age cut off, and is independent. She can file the FAFSA for this year pretty much up until the last day of class.
As a student in Senior status, she is eligible to borrow $7,500. As an independent, she can borow an additional $4,000. Send her to the financial aid office on her campus to get help with the FAFSA process. Since she has no income of her own right now, there also is the possibility that she might qualify for a small federal or state grant. There is no need for you to shell out one more cent in her support if you don’t want to.