The basking spot looks like it's in the middle but it isn't. It's at like 75-80% off to the right. The pic makes it look like in the middle. It's also petty close to the back wall.

I was thinking about the digging and didn't want to have her hurt herself. Cinder blocks are a pretty good idea but maybe very heavy. I was thinking of making a small ram from the dirt towards the water basin and spanning a couple of 2x4 across from the water basin to the side of the cage and securing it in with screws. That way she would have more room to dig and still a reliable way to get to the water and heat depending on how the dirt gets moved around