Your daughter is gorgeous!
My daughter has a compound H almost identical to your daughter's except my daughter's H is on the side of her head. DD's grew the most during months 3-4, and it got to be about the size of a bottle of water lid. The compound part seemed to start going away on its own somewhere around 9 or so months. The graying on DD's Hemangiomas started around 9-10 months, but they didn't get any smaller. We just started noticing that it was less red and had little flecks of gray. We decided to start propranolol when DD was 10.5 months and that has made the biggest difference for her daughter.
Unfortunately, I don't think there's really an assigned time that they will go away. Some kids seem to involute much more quickly than others. Your dermatologist may be able to give you a better idea, but ours was pretty vague about the timetable.