Hi Louella and welcome, You have made and are still making amazing progress. I admire you and hope that we can come up with some good suggestions for your knitting.
I've heard of people using one or two extra long knitting needles. One needle can be braced between your upper arm and body. I don't know of a source but you can probably have them made fairly easily from wooden dowels. There are also single needle holders that are used to brace one needle while you operate the working needle. I couldn't find one of these online but I'll try to be more creative in another search and report back.
Thoughts and prayers for your continued recovery.