The black is normal pigment. Surprising that you can't see any pink.
Anyway, you can still see if they are tacky/sticky. If so, that would indiate dehydration. She shouldn't be though with moist food, etc. and not throwing up anymore or having diarrhea...
I wouldn't be comfortable saying when to start kibble up again b/c that varies by dog and can cause problems to start up again. It's really something you'll need to talk to your vet about. I also can't tell you how long she can go without pooping, but it is more than a day.
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