I've generally found teeth stop bothering mine once the whole width of the tooth is through, if that helps. Canines get wider as they come up though, don't they? I would say if the main peak is through she'd probably be ok, but that's only going by my two. How does she seem? Is she still showing signs of teething? If not, you could always try halving the dose you give her and see if she's ok with that, then stop if she's ok?