Im so happy she is home and doing ok, It sounds like they are charging you to much though, I had to take jasp in for his IV treatments and it didnt cost me near that amount, he was much older then your lilly but only 1.9pds
he was on all the meds and food mentioned in the above post, The latulose will help with her pain as far as pooing, It will be very very soft, they have no control over this, Im so sorry , Im in mich as well, and i know its very hard to find a vet here thats experienced in LS, Your best bet is MSU , Prayers are with you