Geez, you really have been in a bit of a nightmare.  To go from TPLO surgery to discovering  it was that piece of crap disease....all this just sucks!!

Of course, Gertie isn't stressed about all this.  She's just loving being spoiled and being with you.

I'm sure you're  trying ecerynyummy food you can think of.....warm rotisserie  chicken, scrambled  eggs with cheese and bacon, cheese pizza crust, etc.  Also, the Vet coud give you an appetite  stimulant  to try.  Does she act like she wants to eat, but turns her head away as though she's nauseous?  Have you seen any improvemt since she's been on the nausea  med?  Is it Cerenia?  Could possibly  be a "delayed" reaction to the chemo.  

My thoughts are along the same lines as Jerry.  This may not br related to the "diagnosis " at all.    Possivly a tweaked muscle, etc.   Some rest and maybe reintroducing some low dose pain meds may help.

Try massaging  all ,up and down her spine, around her shoulder and neck.  Any signs of tenseness or tightness?  The first several weeks of recovery  it doesn't take mich at all to pull or strain a muscle. 

We know it's hard not to  jump to bad scenarios,  but often  this really is just a sign adapting to three is tiring and jard on joints,muscles, etc. 

So yeah, continue with lots of massages, try any yummy foods, continue  enjoying lounging around in your yard, ask about low dose pain med and or an antiinflmmatory.  

Hang in there!  This may just be a temporary set back and nothing more.

((((((Hugs)))))))

Sally and Alumni Happy Hannah and Merry Myrtle and Frankie too!

PS.  Drinking okay??  Have you ruled out a fever?  ALERT and engaged, just sort of lethargic??