Oh dear, this is getting you down, isn't it. You've done really well to get so far, especially if you're not really enjoying it.
What do you do when she bites? Dd did this to me (and, from his feeding 'style', I suspect ds2 is going to do so, too [cringe]). I found the best thing was to pull her in very tight when she bit, rather than to yank her away, as yanking hurted me, whereas pulling her in startled her into opening her mouth. Also, saying "No" quite sharply, and, if she did it again ending the feed there and then. Another thing that helped was learning when she bit me - which was always when I was trying to persuade her to feed if she wasn't all that interested, eg had had enough or her teeth were bothering her. She stopped within a few days.
As for the feedign to sleep issue...welcome to the club . There are so many threads on this! I was in the same boat - except that ds2 woke every 45mins or so through the night. I separated the feed from the putting down, and, over a period of a couple of weeks, he got better at going to sleep. At first it was very difficult, though. Now I feed, then cuddle upright (for the burp), then into sleeping bag, short play with teddy, short book (same teddy and book now for several weeks), go around switch on fan, baby monitor, cd player, off light, short cuddle, sleepy words, then into cot. I kneel by him and stroke his back until he's asleep or nearly so, and then sit by the cot for another few minutes just in case he rouses and needs more stroking. He often twitches as he goes to sleep, and the twitch would rouse him again, but now it doesn't bother him.
I do the same without teddy and story for daytime naps, but he often has to nap in the buggy or car, and I find that if he hasn't napped in his cot then it's harder to put him down at night.
But now it takes 10-20mins from putting him in his cot to leaving the room. He still wakes 3hourly, but we're working on that.
Will your dh/dp go to her at night?