Probably either growth or developmental. I found the whole six-nine months section pretty tricky with both DCs - they get frustrated because they want to do so much more than they can. Really starting to notice the world and unable to interact/communicate with it. Is her sleep disturbed as well?
Yes she is teething. She has been since 8 weeks when she got her first tooth! Her sleep during the night is not disturbed but actually getting her to go to sleep is a nightmare! She fights and fights it.