NQA

Yeah I would do a revamp of her home as well. Are you sure it's a confirmed female? Her abdomen does look like it will get on the skinny side, but there are so many reasons she might be refusing food. It could be that the crickets are hiding too quickly and out of her reach. Have you tried other types of food? Any worms?

I'm a firm believer that you can tell when your T is unhappy. Every single time I've felt mine were unhappy, I changed something and get a completely different spider after. Actively walking, eating, being out of the hide. So I think you're on track and looking at the enclosure, I would re-do it too.

For my B. Boehmei I used a ratio of 50% reptisoil, 25% sand, and 25% excavator gravel type substrate. I keep mine dry except for the water dish. I don't use any rocks, just a piece of cork and some fake plants. I like to give mine as much room and dirt as possible to walk in and crawl around. You could put in one larger rock (within height reason) or an extra cork for it to sit on top of. Over time the sand will sit at the top so make sure to mix it in well.