I have an 11 month old and right around 8.5 months, his dleep patterns changed as well. We were lucky- he took 2 2hr. naps a day, then a short 20 min. one at night. The 2 hr. ones changed to around 1.5 hrs. and a little over an hr. and the evening nap disappeared. He still sleeps through the night and goes down around the same time every night (10:00)and wakes up usually the same time (9:00) If she get's tired at odd times, it may just be her schedule changing. If she's still erratic with her sleep patterns after about a week, I'd try to put her down a little later at night so that she sleeps a little longer during the day. At first, she may be a little fussy due to the lack of sleep at night, but she will make up for it during the day. Also, I'd try some children's tylenol (1/2 dose for your little one) for her teething. Even though she got one a few weeks ago, you never know when another one will break through... Hope this helps!