American Toad is constantly eating substrate and becoming impacted, what to do?

[Charc15]

I would try regular Dirt, Something that is hard and can be packed down. When I mean hard I mean like clay dirt or something, something she can't dig up and eat. (If you do that, make sure you have plenty of places to hide. So she doesn't get to stressed out.) It might seem hard or mean because she is a toad and should be able to dig, but if she is harming herself and making herself this bloated, it might be the best we can do for her.
How humid is your tank? Do you have a bowl in her tank for her to soak in?