We need some more info from your mother. What water condotioner are you using?

Butterworms are not a good staple food source. Use Night Crawlers from now on or crickets.

Feel the frog's right side. If you feel a hard lump then the frog is impacted. If so then here is what you need to do.

Prepare a luke warm bath preferably around 80° F. Get some Unflavored Pedialyte and for every 10 ounces of water add 1 ounce Unflavored Pedialyte Make sure it is dechlorinated water and only chest or chin deep. Add 4 drops of honey to the bath and dislove it. Soak the frog in this bath for 20 minutes or until the water cools. Once it cools prepare a second bath the same temp and depth, but use only dechlorinated water. Soak again until the water cools. Have luke warm dechlorinated water ready in the frog's water dish. Return the frog home and place it in the water dish.

Keep a close eye on the frog.

Now you say it is only fed every 4 days??? That is not enough. The frog should be fed every 2 days at most and calcium D3 powder dusted on its food every other feeding to every 2 feedings. Dust the food with a multivitmin powder once a week, but not on the same day as the calcium.

Get some more info for us and keep us posted.