I'm sorry, but the tenor of this discussion feels very "victim blame-y".
Why sue Prince Andrew and not Clinton or Trump? She hasn't claimed those men assulted her. I find it weird people are assuming she chose to persue him over US political figures rather then the simpler explination that she is sueing the man she claims assulted her, and the other two men did not.
This whole age of consent debate is also, I think, missing the forrest for the trees. Virginia was a sex traffic victim. She claims she was coerced to have sex with Andrew by Epstein and Maxwell (who apparently had a history of threatening the girls). She can not consent if she has a metephorical gun to her head. The key assertion here, correct me if I'm wrong, is that Virginia claims Andrew knew what was going on. If Andrew knows his friends are trafficing girls and brought one to have sex with him, then it doesn't matter if Virginia was 17 or 70 as Andrew would be knowingly having sex with someone he knew could not consent.
As to why she didn't leave, this all feels like asking a battered woman why they did not leave their abusive partner. This girl came from a rough home life and was mainpulated by people who seemed to offer things a vulnerable teenage runaway would crave: money and feeling she mattered to someone. Other victims describing Ghislaine acting at times like a sisterly figure to help groom the girls. Even vulnerable women in their twenties were victims of Maxwell and Epstein. I can understand how a young woman with no job skills, no money, and no stable family support network would feel trapped into that system.
Did something happen between Giuffre and Prince Andrew? I don't know. However I think there's a way to debate the accusations while being respectful to Giuffre.