Does the food contrast with the plate? She may get frustrated and give up easily if she cant see perhaps while mash on a white plate.
I gave my mum a very straight sided dish an a spoon- as you swept with the spoon , food HAD to fall onto it
Finger food can be good, as can grazing, rather than 3 formal meals- if you are about the house,and not planning on going out, take your time try perhaps cereal, wait a bit, then toast cut into 'pop it in' sized pieces. A small table just to the side with food to pick up and pop in, in her own time.
Elevenses = small sandwich, again cut ready to just put in
1ish - fruit cut up , or perhaps cake
3 ish, cup of tea and cake or biscuit
teatime, dryish food, again just left to be eaten in own time, Quiche, cold meat cut up, a new potato or two.
Make it all mouth sized , Forget cutlery! Fingers may work better.
One of the happiest memories I have of my now late mum, as the pleasure on her face as she enjoyed a carvery lunch in a pub garden....eaten completely with her fingers, in her own time