I’d been thinking that the heart she was playing with in those pics was Graham’s, and she was commanding him to catch Kurt for her. Then she hears them coming, and hides the heart just in time before they burst into the room. And after nearly getting busted, she decides perhaps Graham’s heart would be safer if kept in her vault in the future.
I like that idea! Makes more sense as long as Graham never sees the heart it should be fine. I think we’re going to see a very different Regina in this SB flashback; probably one who is a little unnerved and unsure but trying to muddle through.