H.H.
My son went through this at around 9 months and didn't let up until he was about a year old. Depending on the physical and mental milestones your daughter has achieved, this can be quite a busy time for a 9 month old. My son didn't crawl until about 9 1/2 months and his sleep was greatly affected. He only wanted to nurse or bottle down to sleep and he wouldn't let us put him down in his crib. He would wake up every time. It was very challenging, but it does get better. I think 9 months is also the time when many babies develop terrible separation anxiety. Your daughter may be going through this right now, too. If your staying home with your daughter, try taking naps with her, even if that just means nursing naps so you can rest a little. I felt so tired from the time my little guy was about 9 months until he was one.
At one my son started sleeping through the night and recently at 13 1/2 months, he started waking up again several times at night and, again, wouldn't let us put him back down to sleep in his crib. About a week after this started he learned to walk and started teething his molars. As soon as he figured out walking, he was back to sleeping through the night. Good luck to you. It will get better.