I went to check on my toad, and she was partially burried in sand (like normal) but she looked really slimly and wet, and I noticed something in her mouth!?

I hadn't fed her, so it wasn't a worm, and there is nothing else I fed them that looks like what's in her mouth, but then I thought it might be skin...?

Do american toads shed their there skin!? If they do, will she get impaction form the sand covered skin, she comes from an extremly snady enviroment, so I didn't think it was a problem...?

Really need some help here, kinda freaking out!

Here are some photos!