If she seems to be constipated, the best way to remedy this is to add a couple of tsp of canned pumpkin (not pie filling) to her next few meals. This will add the needed fiber and will even have a laxative effect.
If this does NOT work, you are dealing with a bigger problem and you will not be able to avoid a vet visit.
Let me know if you need more help.
If she won't eat it, you can try adding it to a can of smelly canned dog food. You can even make a slurry out of it in the blender so that she won't notice it.
Most dogs will eat it this way.