Lost another Ear ring

My daughter Sophia 16 months, has lost yet another earring, i never see her mess with them, but they keep coming up missing out of her ears!? Do they just fall out all on their own? Or maybe there is a earring troll who comes along and steals them LOL because once they fall out, they are never seen again. I sure hope she doesnt get them out and then try to eat them? Ive gotten to a point where i rarely put earrings in her ears, but i did yesterday for the first time in a long time, to make sure her ears dont close up, and what do ya know, after going all day yesterday, and me putting her to bed with them in (i didnt think to take them out since theyd stayed in all day) she woke up this morning, with only one earring!! :P I give up!!