Thanks Char
I bought peanut butter and tried it on toast but she didn't like it
Will try again in a few days.
This morning I made our oats porridge like normal but instead of adding milk to hers I mixed in lots of full fat cream (40% fat) and just a tad of brown sugar and she loved it and had loads! Good news is that she really has a good appetite now, better than ever before, and the other day when I changed her nappy I could tell her thighs are getting chunkier again
She has been having many biscuits too lately as I bought some butter Teddy Bear biscuits that she just adores and will ask for all day long
"Biddi! Biddiiiii!!!" and I've let her have loads just to put weight on
Seems to be working, but will have to make sure she starts having more healthy things too.
Thanks everyone for all the great suggestions! It's helping