If you use Nutri-Cal or similar things, always follow it up with a little protein. Give her a few pieces of kibble or whatever she eats. You will probably have to hand feed her and play games to entice her to eat.
Little pups are more prone to having a little poop left behind that can cause problems the next time they try to poop. They require more attention to their little rear ends.
I agree with the suggestion above that if this ever happens again, soak her back end in a warm tub to loosen the stool. For constipation, soak all the way up to the chest.
Exercise helps this problem too.
To encourage water drinking, you may have to experiment with different kinds of bowls. I found that my boys prefer little glass custard bowls over stainless steel, and Max despises plastic, except water bottles.
We keep the water fresh and praise them every time we see them take a drink. (my dad's comment: "I have to praise the water going in AND coming out?"
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I hope your darling girl doesn't have any more problems.