My imha dog has cryptosporidium and it feels like another big dose of bad news!

My dog Inca, an 11 year old border collie was diagnosed with imha at the start of Nov 21. She has one blood transfusion which got her RBC up to 29%. She had a poor reaction to high prednisolone so this was reduced and she was started on mycophenalate which she had an awful reaction to. This resulted in awful diarrhoea which would not go away – she ended up on a drip in early December and was finally put on antibiotics which cleared it. In early Jan she was eased onto cyclosporin which she has tolerated well. Her RBC has seemed to stagnate at around 34 but the vet reduced her prednisolone very slowly as her liver was not coping well. She is now on 100mg of Atopica twice a day and 5mg of prednisolone once a day. Unfortunately she started with pretty severe diarrhoea again and was found to have giardiasis and cryptosporidium. The giardiasis was cleared after two two week courses of metronidazole but the cryptosporidium is still there. Everything I have read is pretty depressing about the available drugs and I wondered if any one else has had this problem while there dog is on immune suppressants? More importantly did you find a solution? While I’m here also any ideas on how I can kick start her regeneration? She has held out at – infant very slowly crept up) her RBC with each reduction in prednisolone but is still only at 34.1.
Thank you so much for taking the time to read this. As you all know it is heartbreaking to see you beloved dog going through so much – and so frustrating because she is so often still so full of life, fun – and her trademark naughtiness!