BLUE TONGUE SKINKS

I was feeding my blue tongue an apple snail from my betta tank and though a small series of events she grabbed the tongs and the small snail (like smaller than a pencil eraser) fell into her bedding and I have been unable to find it since. I took the section of bedding out but I still don't know if the snail is in her enclosure. Will it be harmful to her if the snail ends up lost in her enclosure?

More than likely it won't serve as a problem.

Depending on what substrate you keep your BTS on, it will probably get too dry for the snail to survive long. BTS also have a very good sense of smell so there's always the possibility that he/she will find the snail and eat it as well.