I think this can be a pretty normal reaction to a change in their lives. When I moved DS into a bed in his own room his sleep was terrible for the first few weeks - I forget how long - but I really was getting to the end of my tether with it, I was tearful, I felt I couldn't cope, I was on the verge of bringing him back to my bed because I decided he wasn't ready, and then, suddenly, he started going from 7 until 11 and then 11 until about 6am (when he'd come in with me for an hour).
I think if there had been any kind of upset like teething happening at the same time the disruption was likely to have gone on even longer. I almost don't want to say this because I know it's going to sound horrible, but I really think this would be the worst possible time to attempt some kind of sleep training.
I don't for a second think that what you're going through is easy and I am sure you must be desperate to consider giving up BF if you wanted to continue for longer, so I've tried to come up with some other solutions as I didn't want to leave a completely unhelpful post! But not tried these so have no idea whether they would help or not (although even if I had I suppose it's no guarantee with another baby).
So was going to say try moving her to her own room, or a cot in your room - but this may make nights more disturbed for you as you have to get up every time she wakes. However, you have the option of sending DH in if you can get him to wake up! I think you really need to get him on board and try to tell him how tired you are. I think it's very common that breastfed babies don't want to take a bottle from mum, so if you want to try this as a solution, you are going to need his help.
Have you tried anything from the no cry sleep solution at all? A friend has just found the Pantley Pull Off a complete revelation for her 10 month old who still has a dodgy latch and likes to feed every 1-3 hours at night leaving her with no sleep at all. I think it worked for DS at 8 or 9 months too.
Try calpol, teething gel, teething powders and even amber teething necklace/anklet - just throw anything you can at the teething in case that's contributing to the problem.
With biting you can learn to spot the signs just before they do it and take them off pre-emptively. This does mean you can't doze while sleeping but it doesn't take them long to break the biting habit.
Weird last ditch attempt, but try changing the bedtime routine? It might just work to change the behaviour/feeding pattern she's got stuck in. There are actually some suggestions in NCSS about routines and how they can be conducive or unhelpful to sleep patterns.
Will she take a dummy at all? DS used to like chewing one, he didn't really suck it. Think it was a teething thing.