Does her uni have a good “canteen”? Mine did.
I was a single mum and on a very tight budget and knackered with all I was doing (parenting, studying, voluntary role and part time job) so I actually found that during term time I was better off making lunch my main meal. Very cheap and nutritious in the uni canteen, I could get a main and a pud for about £2.50 then, but mostly just had a main for around £1-1.20 - admittedly about 15 years ago - but I’d have thought there are still subsidised “canteens” in most unis? By the time I accounted for food and energy costs there wasn’t really much in it price wise.
Then I’d have something lighter of an evening, eggs, something on toast, salad, sandwiches...
In addition as she has a shelf in the fridge things that can be eaten cold could be an option - quiche, sausage rolls, tartlets, scotch eggs etc
Things that don’t need refrigerating and can be microwaved: there’s your usual standbys of things like baked beans, tinned spaghetti etc but there’s also “meals in a tin” (myself and others have stocked up on these for Brexit/prepping) - macaroni cheese, chilli, curry, stews, chicken in white wine sauce, spaghetti Bolognese, ravioli...
Think outside the box a bit, outside your preferred healthier options, few foods are completely useless nutritionally - eg instant mash legally has to have certain vitamins added, breakfast cereals are fortified, cous cous is non-perishable and only needs a kettle to make, ditto the smaller pastas (just pour boiling water over a portion and leave to “cook”).
Not all veg needs to be refrigerated, she could have a few potatoes, carrots, tomatoes, peppers, garlic & onions for flavour - all fine to store at room temp. As is most fruit. Quick easy nutrition boost there.
Could she get or could you buy her an old fashioned veggie trolley (see pic) and she can use that for storage in her room? Easy to collapse and pack on weekends.
There’s also more traditional student “fare” which while not GREAT nutrition wise will fill a gap. Fine if not eaten every day.
Things like pot noodles, pot pasta...
Don’t forget things like condiments, herbs and spices which can make the difference between bland and punitive and tasty and comforting.
Snacks more on the healthy side than most students would even think to have - dried fruit (Sainsburys do wee snack packs I’m sure other places do too), cereal bars, seeded crackers, nuts, snack packs of seeds (I LOVE sunflower seeds), peanut butter and marmite for on toast are packed with vitamins.
Will she have toaster and kettle?
Remember not just bread you can toast, also bagels, muffins, crumpets (I’m on a kick of these at the moment), waffles (inc potato), potato scones (my fry up cheat leaves frying pan free for everything else)
I’ve recently been converted to toastabags which not only can you use them for toasted sandwiches but many other things too - veggie burgers/patties, bacon, even chicken nuggets apparently (I’m veggie but I’m just googling for reminders and for meat stuff), pasties and sausage rolls...
She’ll be fine