How could she have done this?

[Jodzie04]

So I didn't get Buttons out last night (the one day a week I don't as I am at my OHs) and I got her out tonight and noticed these :



I totally freaked! I have checked all her cage and can't see ANYTHING sharp. The only two things I can think is :
Sand Bath
Her wrecking the grass mat?

I am really worrying!
They seem to be healing so I thought it's best to leave them?

Her cage :
Can you see anything ?
(I have covered the wrecked corner now)


By the way I did remove the mineral block from her wheel, that's from her trashing her cage in protest of not coming out for one night a week