Desperate lady needs input on her kitty-care...?

Everyone out there reading this, bear with me...I am beside myself on this & have many, many years of experience w/felines but this one is for the ages and & need some input from those of you out there who may have something productive to share. (Please, no idiot responses b/c this is serious = thanks). ...I'll try to make this brief...Last Sept. a stray female feline wondered up to property. She was very, very thin, young (prob 1 yr. old now) and had swollen teats. I knew she had kittens somewhere. I fed the poor starving animal b/c she was eating out of my trash can! Yep, feed a stray, they stay. Kept her as outdoor kitty. Have 3 car garage, heated in winter & doggy-door that cat was trained to use. Have food/water bowls & bed. Cat is a good, sweet, loving thing & a good mouser. She got pregnant again ( :-o ) & gave birth to 5 beautiful, healthy kittens. Gave all kittens away @ 8 wk. mark. Made plans for spaying. Financial times b tough so found one who'd do on the cheap. (it included all shots = we were thrilled @ the $65 quote!) Had to wait 3 wks. after last nursing of kittens & @ that 3 wk. mark, "Riley" went in to be spayed. Now, we were warned about this vet being known as a "butcher" and that a lot of folk around these parts usually has ended up w/dead pets after he gets hold of them. I was worried & concerned but again, times b tough; had to risk it. Riley went in on 5/23. Picked her up 5/24. Yep, she was "butched" & butched BIG time. I set about spoiling her & kept her confined for 3 days. On 5/31 @ 2:15pm, I found my little Riley-girl laying out in my driveway w/her guts lying outside of her body cavity. She was still alive! I ran to her, scooped her up w/guts in other hand. Put her in her carrier cage, sped off vet - HAD to use same one - what other choice did I have? (He ended up duping us & charged $125 for the spaying/shot deal - who's da sucker now folks?!) I have been traumatized, hysterical, depressed, worried & guilt to the 10th degree over all of this folks. ....still cannot get the image of poor little Riley out in driveway w/guts hanging out & believe me when I tell you that I am a "tough bird" when it comes to things...(No wuss is Miss Joy!) Vet nvr. sanitized hands or table, nvr. cleansed her innards. (I know b/c I stayed & witnessed it all). Shoved 'em back in & stitched. Filled her w/antibiotics, kept her for 2 days then sent her home w/me having to do wound care for 10 days & an antibiotic pill x2 a day. Vet said only 1 in 100 survive this sort of thing. Cat got constipated b/c of meds. Had to take her off for 2 days to soften bowels. Wound came open AGAIN 2 days ago. Rushed her back, this time he DID re-open her, cleansed everything, put her back together & I brought her home ystrday afternoon. She was full of infection & wound came open b/c she is so eaten up w/infection that her skin had begun to rot. It is amazing to me that this poor, innocent, sweet & loving animal has survived all of this (Me too!) and she'll drink fresh water, eats very, very, VERY little. Actually wretches @ smell of canned cat food. Will lick juices of pork fat ( to help w/bowels?) chicken noodle soup juices and kitten formula. Blessed little thing will even use litter box I've set up for her while she's on "lock-down". Vet sent me home this last time w/a spray for wound care called "Vetericyn" that cost us $30 for 4 oz. We gladly pd. him for it as the sucker did not charge us for the last two "episodes" (which he shouldn't have = bung hole) ...sorry... I have to spray her wound x4 a day & back on antibiotic pill x2 a day. I seriously need to bathe her as the infection "juices" that had been dripping & dripping out of her is all over her lower abdomen, legs, etc. I need to wait @ least 3 days to allow the fresh wound (surgical site) to seal before I make that attempt. What I need from anyone of you out there reading this is this: What can I do to help poor little Riley to eat & keep up her strength & health? Please, I am desperate. I care deeply about this animal and she did not deserve this happy-crappy & all that she's now gone through & I'm betting this kitty has used 5 of her 9 lives on all of this by now. (?!) (sigh & sniff) I feel so guilty & responsible and if she's still living after all of this, well then; Miss Joy ain't throwing in the towel either! Please, please, please - I am begging for ideas to get Miss Kitty to eat. Thanks for reading this folks. I have a good little cry each & everyday now for this animal...