I just barged in on her, because I didn't realize she was asleep.
Yikes! When did you realize she was asleep.
Not until now, when I went to go find her.
You should be more careful around people that are sleeping. It would be rude to wake them up when they don't want to be awake. You should take other's feelings into account.
Well she didn't even wake up.
It's good to enter a room quietly, when you don't hear sound coming from it, just in case the person is asleep. A lot of people don't like to be waken up.