It's so obvious that Ruby is planning to go to Oxford for a Masters and her motivations for doing so are so apparent as well.
It's nothing to do with it being the best step for her career wise; she wants to be an author, so something creative would be the best step, which Oxford doesn't offer. She wants to go because it's her clinging onto a childhood dream, so if she gets in, not only (in her mind) is she vindicated after the bullies at Oxford didn't give her a place first time round, but she will be able to preach to her subscribers that everything works out in the end, just have to believe etc.
She'll be dreaming of posting "Study with Me at Oxford" and putting Oxford into every title and romanticising it at every opportunity. It's just like Jack Edwards, who applied about 3 separate times. It's sad that they place all their self-worth on a place at one university and can't move on or accept that perhaps (shocking as it may be to them) they aren't cut out there and there are (amazingly to them) other students who are more suited and more capable.
I wouldn't be surprised at all with a 76 if Ruby gets a place as at Masters-level there's no interview for her to trip up on. The content will be unbearable.