Hi, she is lovely.
She'll need access to Meadow or Timothy hay all the time, some pellets and fresh vegetables every day particularly ones that contain vitamin C as guinea pigs can't produce this by themselves. Check out the Food/Diet forum on here for tips and advice about types of hay, pellets and what veg to feed, there is some good advice on here, including a list of what not to feed.
I feed my boys Burgess Timothy hay mixed in with Meadow hay from the Range, Burgess excel pellets mixed with Vitakraft pellets (as I'm transitioning them from one food to another) and I feed them the following veg per pig in their own bowl:
1 slice of cucumber
1 slice of celery
2 slices of green pepper
Half a spring green cabbage leaf
1 green bean
1 sprig of coriander
And as a treat they have 1 lettuce leaf (usually lambs lettuce or little gem but never iceberg lettuce as this is bad for them) or a cabbage leaf ripped up (usually Cavolo Nero or tenderheart). They occasionally have Vitakraft chew sticks, a carrot topped cottage, a Naturals range carrot filled log or a Naturals carrot and parsley chew. I would give these round once a month and at a maximum of two at a time, but this is just my personal routine with them.