I don't have an oven, just a microwave anda hob, so this isn't too far off how I live normally. Unfortunately I don;t live near an M+S but if I did I'd be stocking up on
their ready meals (they do some healthy ones I think, and your daughter might like some of them if she won't eat what you can make) and also their packs of veg (veg often does really well in the microwave), so you could warm a quiche, and have it with salad or greens and some warmed up pre-cooked potatoes? Or take the more traditional 'meat and two veg' approach: buy your cold meat (or hot roast chicken?) and have with microwaved broccoli or carrots and defrosted peas? I imagine you could do steaks etc on the grill to go with too.
Pulses make great salads. Try a warm lentil salad - drain and rinse a tin of green lentils (puy are best), warm gently, then stir in some feta, halved cherry tomatoes, beetroot (not the stuff preserved in vinegar) and parsley. Lentils are also good with sausages if you can do them on your grill. Or try chickpeas with chopped chorizo, tomatoes, red onion, parsley and garlic.
Do you have a kettle? If so you can do couscous which you can stir anything into, and which would be nice with cold roast chicken breasts.
You can do fry-ups using the mini-grill, with toast if you have a toaster.
Eggs are fine in the microwave. MIL does scrambled eggs by zapping them and taking them out every few secs to stir. You can turn that into a light lunch or supper by leaving them very liquid and serving with broccoli and anchovy butter, which is delicious. For breakfast every day I have a knob of frozen spinach, which I defrost in the microwave (1min) with two eggs cracked onto it and cooked (2 mins plus a few secs of necessary - the yolks should be a bit runny) with pepper and parmesan on top.