Hi Ricky! Congrats on getting little Lucy!! She's a looker for sure!!
What you saw in her tank was urine and urates (solid urine). You'll know the poo when you see it- poo is always brown!!
You need to try to get your basking spot temps stable and steady. Do you have your UTH controlled by a thermostat? Hot spot ought to be about 90-92F and the cool side ought to be about 82-85F. The air (ambient) temps should be about 80-85F.
I am worried about the humidity! It ought to be at 50-60% throughout the tank. I think your light is burning up your humidity!! There are lots of ways that other members deal with this: seal off a portion of your tank lid; place a damp towel across your lid (that you wash at least once a week); get a mister..... I'm certain that other members will chime in about what works for them!
This is a great start and I'm so glad that you're asking questions and checking your methods!
EDIT> Ooops, I forgot to mention that basking temps at 77F are way too low!!! You need to keep them up at 90-92F. Hmmm, I don't think you have a t;stat.... how are you controlling the heat on your UTH?