We didn’t have an oven for over a year when we last moved, we had a slow cooker, halogen oven and a portable hob (£15 on amazon!) and we ate normal food everyday, it was hard work and took planning etc but it’s doable! People are always selling halogen ovens on selling sites, so wouldn’t even cost much!
You can do loads in the slow cooker, I do meatballs, lasagne, chilli, spag bol, stew, bread, whole joints of meat etc, the burgers would have been fine if she had them on a rack and not sitting in fat!