Hello, my friend is living in Nigeria on a student visa. She's an American citizen. She was doing her project in OBAFEMI AWOLOWO university, but now she had to cancel her project due to financial issues. She wants to get to USA. She got her passport back and got through medical test. In the medical test, it was found she has gallstones. They said she can't travel unless she gets full treatment before leaving. Is it true? Please tell me can she travel or not. They're not letting her travel to her native place.