I can say that when Doodlebug had his LP issue it seemed to me like all of a sudden he took a turn for the better. So hang in there and hopefully Pixie will improve with rest. She is probably pretty groggy from the pain meds so it would be expected that she would just want to lay around.
I'm sorry that you had your own health issues recently and hope that you are feeling much better. But boy that was a LOT of money for an ER bill.