kAT1jk - the night terror was very clearly something we had never seen before...essentially we heard this shrieking, the worst screaming we'd ever heard so we raced upstairs thinking she'd broken a bone or something but she was screaming with her eyes closed and didn't seem to even notice us picking her up, taking her downstairs, singing, rocking, etc...it wasn't that she was upset and therefore difficult to calm...it was clear that she had no idea we were there and was 'somewhere else', somewhere that was terrifying to her. Eventually it just stopped quickly like a faucet being turned off. Weird!
you asked about whether she'd been crawling before then and she had been crawling for a while but more like a commando crawl (with arms only) and usually backwards, LOL! I'm not suggesting that all nightwakings at 9 months are because of crawling, but they are often due to night terrors, sep anxiety, and milestones including crawling, standing, etc..
Sarah