Chances are she'll be selling CDs and hi-fi equipment. Asda had vacancies to fill and all they want is someone with a modicum of intelligence to fill them. As someone who once worked in a supermarket and then made my way into admin work, I can tell her now, it won't happen internally. My company offered training, and I have retail qualifications to prove it, but those of us on the shop floor, so to speak, never had grabs at the admin vacancies. I had to look elsewhere to get that sort of work.
Think about it. The lass works hard to get a qualification in Admin, then goes across to retail. She will most likely be asked, if she gets an interview, why she's spent the last x number of months NOT working in admin (and there is a lot of admin work around, believe me).
She'd be far better off going to a decent temp agency, if admin work is what she really wants.