I'm an SM, retrained at one of the London drama schools after a career in a non-theatre-related profession.
For interviews, I'd definitely suggest emphasising her enthusiasm, her keenness to learn, and so on. It sounds liks she's recognised where she may have gone wrong, which is great, and I would agree with her assessment of her own interview. When I was doing my training, current students would meet the interview candidates, show them around, chat to them about the course and so on, and the ones who talked about, "I know everything, I ran all the tech at my school, I'm an experienced lighting designer" (or whatever) were the ones we knew weren't going to get in.
A PP mentioned volunteering at fringe venues as an ASM. I don't advise it myself unless it's somewhere that has a proper internship programme set up. Unscrupulous fringe venues use volunteers to SM their shows, who end up way out of their depth, with no support, no possibility of learning best practice from industry professionals, frantically trying to fulfill all the requirements of director, designers and actors, and having to take the show washing home with them every night and pay for washing powder out of their own pocket.
London is a great place to train, but very expensive. Although the drama schools don't have accom as such, there are always options. In my year, 4 students shared a house for 2 years, it was taken over by new students on the course, and 6 years later goodness knows how many students from our course have lived there.
I worked harder during my course than I have in any job since, (at least you're getting more for your tuition fees, with 40+ contact hours a week!), but I wouldn't change it for anything, and am incredibly proud to have trained where I did, and my certificate is on my living room wall.