Tresaderm is a familiar bottle in my fridge as I have a couple cats who tend to ear problems. I've never noticed any thing such as you describe with either cat, though you never can tell aobut side affects, can you?
Be sure to keep an eye on her now. If the increased appetite continues now that the medicine is finished, something else might be going on and the timing could be coincidence. How old is your kitty? Sudden increased appetite can indicate hyperthyroid problems. Has she had bloodwork lately?