It COULD be the teething and she's just not responding to the drugs.
I'd look into the osteo thing, too, just to rule out anything physical or deal with it there.
It can seem like an even bigger problem when your partner is annoyed and turns to you to fix it - you've got the initial problem as well as the burden of someone else's annoyance to deal with It makes it harder to follow your heart when there's the extra pressure of having to 'fix' it, as if it's something YOU are doing that's causing it.
It may or may not be possible to explain to your partner that it's something you may just have to ride out and that in due course, it won't seem like it lasted for very long.
FWIW, my 22 month old doesn't sleep through - he stirs for feeds, so we dont' exactly wake up, but I couldn't honestly report that as sleeping through. If he didn't sleep in our bed with us and have a boob put into his mouth right away, he'd keep us up, too. DP has learned that we ride the more wakeful episodes out - they are always just phases - and that because of our sleeping and BFing arrangement, it's easier to deal with especially for him (heaven forbid he should have his night disturbed!).