hmm, off the top of my head the biggest one for me is Helpless but I also believe we have it in Fool for Love (staked by her own stake), she is cut in Becoming II, and we have a pretty beat up Buffy in season seven around Showtime. I'll see if I can remember specific ones for you.

Yeah Helpless and Showtime, Both of those episode's she is pretty beaten up.

In Primevil Buffy has a huge gash on her head.

And in The Freshman Sunday hurt her arm pretty bad.