In my opinion, if we have been blessed to feel peace about a deceased loved one, we would be ungrateful to "throw ourselves on the floor in tears." Maybe that is how some expect you to act, but God has given you this peace and understanding with regards to your daughter. It's a precious gift. Doesn't mean we still don't feel sad and miss them terribly, but knowing a bit of a bigger picture here helps a lot. I think you are handling the day just fine. I'll be thinking of you today.