3 yr Ex battery diagnosed with possible Avain TB, Large liver any help/advice ! similar experience ?

Hi there I was wondering if any one could help with advice or if anyone has been through a similar experience with their hens? My 3 year old ex battery (beautiful Scruffy) I noticed looked a little under the weather and her comb started to droop. After losing 2 to cancer earlier this year we made a vet appointment straight away! he felt her and said she has a very large liver big enough to be able to feel through the skin!! He said he would be possible avain tb as she has severe liver problems. Blood tests and a biopsy could properly only confirm this. I don't want to give up on my girl!! was wondering if anyone has had any experience like this and has any advice please ?! Thankyou Em & scruff