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If her teeth are overgrown and now clipped it's important she has plenty had food mix to chew on to keep them trim. Does she bar chew at all? They can make the teeth uneven so they don't meet correctly which means they don't wear down against each other so they do need watched.
I agree though that sometimes they are just not interested in some treats they used to love so maybe try a bit of carrot or brocolli and see if she can chew that well enough?