Should I Euthanize?

Please excuse if things are worded poorly, I am currently crying as I write this post. While cleaning the enclosure for my two pets snails, starlight and moonbeam, I put them in their feeding dish on my kitchen counter while I cleaned their tank in my sink. When my back was turned, the two snails must have crawled onto the same side of the dish, causing it to tip over and roll off the edge of the counter. Moonbeam appears unharmed but Starlight must have fell directly on her shell, causing a pretty gnarly crack. I’m devastated. I never want to cause them pain. I’ve had these nails for over a year now, and I’m pretty attached to them. Lots of things online say that I should put her out of her misery, but I just wanted to get second opinions before I make that decision. I tried to get some pictures of the side of the shell, as I’m not really sure exactly what mantle collapse looks like. She is still crawling around, however her antenna are kind of going crazy, I would assume because of the pain she’s in. Should I put her out of her misery? I really hope this post doesn’t garner hate, I feel so extremely bad. :”( when she tucked inside her shell, I can see the thin layer of shell moving, however I do not see any of her internal organs exposed as of now.