My snake is eating weird things!

Question
I have 2 snakes, one corn snake and one rat snake, both about 2-3 years old. Our rat snake is a "brat" if you will and always has been lol. She is different from other snakes, so maybe this whole thing is just because she is weird lol. But obviously what she is doing is not normal and could be dangerous if she succeeds. Recently her body condition has declined due to poor nutrition (other snake eats the same thing and has never been unhealthy, so we didn't really think anything of it). So Vet recommended vitamin/mineral supplementation along with feedings. We did that and she is improving. Due to her poor scale condition, she was getting tiny splinters between/under her scales which we could not see except under a magnifying glass. This was due to their substrate (Recommended by a "snake expert") which was a moist mulch-like substance. Also recommended was carved out wood tunnels so they would have something abrasive to help them shed. Obviously the Vet said to use something else softer and "cleaner" as their bedding. So I put a towel down on the bottom and a washcloth for them to burrow under. Well, one day my boyfriend screamed for me saying Lilly (the trouble child) was attempting to literally swallow the wash cloth. She is about the width of a dime-nickel and maybe 3-4 feet long. She had half of the wash cloth down her throat and was extremely stretched out. So I obviously needed to get it out. I knew not to pull it out, so I gently coaxed her to spit it out by touching her behind the area where the towel had been swallowed. She spit it out pretty quickly but we were still shocked that she had done this. We had fed them just a few days prior so she obviously wasn't hungry. Had I known this was as rare as it apparently is, I would have taken a picture, but was in a panic at the time. Well, she didn't learn her lesson that time so attempted it again, only not just with the wash cloth but the actual full-sized towel on the bottom of their cage. We knew this because we came home to find a 6 inch section of it sticking out and compressed, covered in mucous stuff (her saliva) at the end. She obviously was able to spit it out on her own that time. I am thinking of other bedding options for them seeing how she has "sensitive scales" I guess and can't be trusted not to swallow dangerous things, like a child lol. I just worry that one of these times she will eat something that she will not be able to dislodge or digest and kill herself. Is my snake depressed? Lonely? Suicidal? Lacking something? Or just retarded? lol Hope you can help. Thank you :) By the way, I do love my snakes thought I make fun of her. Trust me, if you met this one you'd think she was a brat too, no matter how many times you hand-socialize her lol.

Answer
Well I've never heard of one trying to eat a washcloth. If it was damp, I would guess that she is dehydrated. Do you have fresh water available all of the time? I would also suggest trying to feed her more often as it sounds like she is hungry to me. Regarding substrate, I usually use Aspen bedding found at most pet stores. I've never had a problem with it. For hides, I have found styrofoam panels to work well (like what's used under hamburger), as well as the container that you find inside of Lean Cuisine frozen meals. Just cut a small entry hole in the side of it. I'm sure your snake won't swallow either of those  :)