I'd just keep offering casually and if she refuses move on. If it is teeth causing it she will likely come back to it soon. As long as you know she is having good solids like veg, fruit, protein, complex carbs and good fats (and not sugary foods with little nutritional content) then I think that is fine.
Also, have you tried medicating if you think she is experiencing discomfort from teething? Or offering something cold to bite on just prior to offering the breast.
You could also try a nursing necklace or toy around your neck for her to play with while nursing to keep her interested.
Getting in the bath together and letting her help herself can coax LOs back to the breast as well
Getting your periods back can sometimes cause a lack of interest if it causes the taste of the milk to change so just something to consider if that applies.
Another option if you really want to get more milk into her is to pump and offer the breastmilk either in a cup or bottle or with solids like cereal.
I'd also be sure to offer water with every meal so she can stay hydrated.
HTH
