Oh my goodness Charlotte - that is just so very very sad.
I'm sure you have tried everything but as a Mama of a very picky and independent eater I *still* have no idea what to suggest. Mainly as I would never ever do that iyswim?
The thing with finger feeding is that they HAVE to be left to do it alone. They have too. And it this Mummy won't do that then I just can't think what to say.
What does J eat? Very little really (and was the same at that age).
Our 'easy' foods at that age were toast fingers, toasted teacakes, cheese spread sandwiches, grated cheese, yoghurts that he would spoon feed himself (in a fashion
), fish fingers cut into bits, peas. Fruits and the like were successful later on but he took ages to get used to the slimy texture and stop flinging it or squishing it. Chunks of banana were the first I think, and blueberries. Dry cheerios, and shreddies dipped in milk were his cereals. Scrambled egg picked up. 'Dip dip eat' with toast fingers and boiled eggs.
Meat was rubbish at this age as he didn't have enough teeth to manage - but little bits of ham, roast chicken, and sausages were the first things he did accept and cope with.
Anyway - they are essentially all 'no cooking' options. And it is not a list I am very proud of TBH - but it is better than waht she is doing ATM.
J has been under the feeding team for refusal to feed and I will happily tell you all their advice as well - but it really is mainly food play etc etc - and leaving them to it. No food battles etc.
((hugs)) to you and that poor LO.