If she is having issues with not peeing often and has not had a bowel movement in 2 days, you need to have a vet check her as she may well be constipated and unable to do anything about it.
It may be necessary to add water to her food, I added equal amounts of water to food, and if constipated, you could also add miralax or restoralax to the food, but be sure to add more water to the food with the powders.