Firstly why do you say yet? Clips and flats are different things, you don't move up to clipless pedals only across.
Secondly, change the pedals for something less – well sh1te really. The std flats that come with bikes offer limited grip but will still remove skin quite nicely.
Ok, shoes … 5:10s are about the grippiest shoes you can use with flats but they may not be to her taste (even the womens version) so I'd suggest some type of skate shoe, eg Vans. You're after something with a flat sole, that's why walking type shoes aren't always the best. Don't use a clipless shoe unless you don't like her much 😉
Sorry if it sounds a bit like a rant, it's not meant to but I come across the situation a lot.