As long as there are plenty of round poop, the non-cecal kind of poop, excessive amounts of cecals are generally considered a dietary issue due to a diet too rich in fat and protein and without enough fiber. Since the Tresaderm is applied topically (on the skin) it shouldn’t have a big impact on the GI bacterial flora. There is a disruption of the gut flora though, that’s what makes the cecals wet and inedible, but this disruption is most often remedied with more fiber (hay) and less pellets. It’s of course a bit trickier with a very young bun like yours, since young growing buns need their nutrients.
If the round poops shrink in size and amount or if she loses her appetite or seems uncomfortable/lethargic, you should contact a vet, young animals are more fragile than adults. If she seems ok except for the sticky poop, you can try and entice her to eat more hay and temporarily cut back a little bit on the pellets, then call your regular vet on Monday just to make sure it’s ok to cut back on the pellets.