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

[gut]

Maybe paper towels would work, like one would do for a quarantine setup? Its not pretty and you'd have to replace it often for mold but everything else sounds too edible.

EDIT: okay clearly my critical reading skills need work. I skipped the last part accidentally. Though putting her outside would probably kill her because if her dirt eating isn't husbandry related, what will stop her from doing it in the wild with no one to soak her? This is really a tough one, sorry its happening to you.