Okay, I've done as you've all suggested. I divided off half the tank (so there's 10 gallons now) and am just leaving the frog be. I put a couple crickets in last night, but they've climbed up the divider (it's cardboard), so I guess I'll have to find a different divider. I used a little dish to put some squash in so the crickets have something to eat instead of potentially biting the frog.

Thank you so very much for your help. I'll keep the forum updated of any changes. I'll just let her be for the next few days and weeks. Thank you so much. >.<