((((((((((freewill)))))))))))))))

Maybe she's doing it to cause you the most amount of pain, in an area that isn't easily seen? If you're forced to walk around on it, that means you're constantly feeling the pain until it heals properly. It's also not-life threatening, which I guess is a good thing considering the many places that one could SI.

Can you talk to her and find out why she's doing it?

Send me a PM if you ever want to talk, okay?