Hmmm...well first and foremost, the fact that she SEEMS better, is a good start. I know the numbers aren't great, but we get caught up in numbers sometimes here. Remember that Olivia is not just a number. Her symptoms having gotten better is GREAT.
As for her numbers...that's a tough one. My honest thought is she just isn't getting enough insulin. Any numbers you can get at night are helpful, but the other night you got a +6 which was yellow and then she was black in the morning. Looking back a few weeks, she was hitting her low numbers early in the cycle.
Has anything changed foodwise or environment wise? Any possibility of an infection of some sort brewing? If not, I think she might just need more insulin right now. She's not getting very low during the day and what we've seen of the night isn't low either. I know she was doing well on 2 units not so long ago, but insulin needs can change over time.