Lovely numbers, keep on doing what you've been doing.
Remember that as the cycle progresses, it's likely that she'll need less carbs to keep her surfin.
I found, with George that I needed to be more agressive with the carbs earlier on in the cycle say before +4 in a cycle where he was dropping early, if I continued being heavy handed with the MC or HC after +4 then what I found was that I would affect the duration and he would jump right up by next PS.
So if at +4 Millie is still staying flat you may want to just try LC snack at +4, to see if that will keep her surfing along, the idea is to keep them surfing along in green for as long as possible, I found that keeping notes alongside his BG in the ss of what I fed and when really helped me figure out what worked with George, I tried different strategies, and when I looked back i could see what worked for him and what did not.

