Grieving.
It is going to take a lot of time to level back out. You expected an outburst of emotion and a bit of thunder - understandable.
To get 'over' a death (it never is over, it will come back again and again - unexpectedly) but leveled back out to where you have your 7 year old approaching what 'normal
was, will (likely) require a long term commitment to listening to her stories about her grandpa. To get there, you might want to figure out a commemorative project that "you" are going to do - and just need a bit of help in accomplishing - or planning, or "I had these ideas, which one would be better?" to get the stories started. Until she can tell HER stories of her grandpa, then it won't be 'over'.
You might try something like Story Core on PBS, you want to start a tradition of a verbal archive of memories with family members for future family members to have.
RileyG
Outside Carney, OK