Thank you everyone! I chose to feed outside of the enclosure to avoid getting tagged if my hand goes in the cage. I've read in a lot of places that it doesn't really work and it's highly debated, but I think I'll just stick to what works for me. I also switched to paper towels because I was afraid the aspen was going to mold(which it did actually start to in one corner) and spread bacteria. I put a few layers of paper towels over the heat mat(and yes, its a low power mat for 5.5 gallons) to avoid any burns. The heat lamp also is low powered, and keeps the ambient temps nicely. I plan to get a ceramic heater in the future.
Also, the shed has been stuck there since last week and she only got a little bit off, so I think tomorrow would be a good time to soak her.
The fuzzie we fed her was just a bit smaller than her widest part, so if she grows dramatically within the next few weeks, I'll check out the sizes of the mice they have at the pet store and see if it's good enough for an upgrade.

And here are the photos of my little darling! She(not sure if it's a she, I just enjoy saying it) is about 1 and a half feet long, and I named her Caesar.