thank you all for your kind and nice words, they were heartwarming to us. and lo, all the good energy did help, our kitty is still alive.
so we got Poesie back from the vet. her blood results were weird.
several factors were way out of the normal ranges but the vet had never seen that specific combination. he said he also felt lumps in her guts, and that some of the blood factors might indicate tumors. he put her on a drip so she got hydrated again. I am now force feeding her with hills prescription diet with a syringe (without the needle of course) and boy does she hate it when I do that!. the vet says she may perk a bit up, but to not expect more than a few days, maybe weeks, and who knows a few months if we're lucky. she sleeps most of the day, but she does purr when we give her nice kitty rubs and massages. we are monitoring her to see if she's got too much pain. if so we will call the vet to come and euthanize her here at home.