hi
@Angelmonkey
along with all the other suggestions, it may be worth considering whether your mum is forgetting how to manage eating a meal eg cutting up her food, what to do with cutlery ... even realising that she needs to have more than a couple of bites or to chew the food
I realised that my dad needed to have me eat with him as he then could copy what I did ... and I cut up his food so that it was all in bite sized pieces, even putting out a spoon for him to use rather than a fork (I did the same for me so he saw my food was cut up too etc and didn't feel he was being treated differently)
he also liked to have plenty of gravy or sauces so the food wasn't dry ... stews, soups etc went down well
sometimes too, there was just too much food on his plate and it put him off
and at times he would seem uninterested in the food but if I left him to take his time, he gradually ate it ... I'd tell him it was fine if he didn't fancy it right now and I was just going to have mine then I'd get pudding ... we always had a pudding (he loved the childhood kind with custard or cream or icecream) and some fruit
and check your mum's oral health just in case