Here are a couple of suggestions:
You could try to add some of the canned form of the kidney diet or add some warm water or broth to the dry food. Also warming it up will help to increase the smell and make it more enticing.
Check with your vet, but in most cases of kidney failure, add a little carbohydrate to it won't hurt and may help to entice her to eat better. This would be things like rice, pasta, potato, etc. You want to stay away from protein additions, but usually carbs are safe.
Also, if she is really not liking the Hills diet, you could see if the Purina prescription formula for kidney disease would be ok to try. In most cases, they can be used interchangeably and sometimes they like one more than the other.
Finally, one point to know. The sulcrafate works better in a acid stomach so I would give that first, wait about 30 min before the pepcid and then feed. I have not heard of these meds causing an upset stomach, but many dogs do not like the food well. Sometimes it can be difficult to know if they are not eating because they don't like it or they don't feel well. Work with your vet to see if you can find a combination she will eat. Nutrition is the most important and it is better for her to eat a little of the non-kidney diet if it means she will eat better versus having a poor appetite and not eating enough.