Chin ate a sticker???

So my chinchilla Tinsel was playing outside her cage while I was pasting stickers into my planner. I was watching her, and when she went to a place she is not allowed I nudged her away. Then, I let her sniff my planner, and she seemed to pick a sticker off and start chewing on it. They were those 3D stickers, kinda like foam or whatever.

It was a very small one. About 5 millimeters long and 2 millimeters wide. Will this be toxic to her? I am very nervous and worried.