76.4 is pretty perfect cool side imho. Unless the gradient is really sudden where is 76.4 there and then jumps a lot higher for the entire rest of the enclosure, I'm leaning towards that she is building, especially if you see a pretty noticeable thickness right about 1/3 from her tail vs right about the middle.
She should reabsorb, but if she decides to lay slugs, you need to be mindful of when to expect them and be ready to take her to the vet if she has trouble. Take careful notes of dates of anything significant, including refusing food, shedding, change in her appearance like she is brightening up, and if she has a sudden drastic swell.