On the PS - you get one shot at it, it will be read by 4 different med schools and it has to be much more than OK.
(Forgive me if I'm saying things I've said on other threads.)
Above all, the PS has to convince admissions tutors that she has it in her to be a doctor and survive the training.
They will all say that they've always wanted to be a doctor, save lives and have spent hours and hours slaving away in care homes.
The trick is to say all that and still stand out from the crowd without resorting to flippancy.
She should begin with why she wants to be a doctor and perhaps mention a particular aspect that holds a special interest, maybe citing some research that has been read.
Work experience shouldn't be presented as a list of things done. The PS should show that the student has assimilated things from the experience.
Don't be afraid to push the extra-curricular stuff. This gives tutors an idea of what sort of person you are and they like someone who has a release mechanism/ other absorbing interest. It shows a rounded person and an ability to withstand pressure.
Spend a few hours digging out all those school certs and awards to remind yourself what you have achieved over the past few years. You will probably not mention most of it but it might reveal a pattern or a personality trait that is worth highlighting.
Things that worked in DD's favour were work done with children; eg, as a classroom helper in science lessons working with statemented children. Also a months work as an au pair and some teaching in a foreign school whilst on a language exchange.
The interviewers were far more interested in these things than they were about the obligatory spell in a care home and shadowing a GP.
I was puzzled about this but now I know that students and doctors spend a lot of time teaching other students so she had ticked an important one of their boxes without realising it.
She made much of her musical experiences and one tutor commented that she obviously sets herself high standards. It could work equally well with sport or dance etc.
You will be asked about things on your PS at interview so keep a copy, read it before each interview and be sure that you can justify every word of it even if things go right up to the wire next April.