9 months and still having sleep issues! Help?

I have been battling with Ember's sleep since she was born. When it comes to bed time around 8pm-ish she seems exhausted and falls asleep but wakes up an hour or 2 later and stays up for 2-3 more hours! I am so exhausted.

Here's an example of her schedule:

Woke up this morning at 6 am (went to bed the following night around 11ish)

So, awake at 6:00am

Bottle, food, play

Nap at 8am-10am (sometimes not a full 2 hours)

Awake, bottle, play, food etc

Nap again at around 1pm- 3pm (again sometimes less than 2 hours)

Awake, play, bottle, food, play etc

8-9pm ready for bed, fussy, sleepy. Goes to sleep.

Wakes back up at 10pm (or 2 hours after falling asleep) and is up til 12 or 1am. And wakes several times for a bottle through the night, but "sleep eats".

Why is she waking up after "bed time "? Its like she is using that as a 3rd nap. I've tried putting her to bed earlier/ later and either way she ALWAYS wakes an hour or 2 after going to sleep. I don't know what to do, or what to change. Its like she just takes decent cat naps and wake up and isnt really getting a full nights sleep.

With my older two children, I never had this problem when they were babies. They went to sleep at night, stayed asleep and woke up in the morning after about 10-12 hours of night sleep.

What is going on??!