Well the leaves are serrated and not smooth on the edge so I'm guessing not lilac. The stems aren't red. Both of those look really close except for the small details.I'm kind of leaning towards a elder of some sort, a few years ago I cut down a overgrown half dead ugly bush next to it, and three months later it just sort of appeared and looked good. I suppose it was finally getting sun. But I've never noticed seed pods or berries. I've got her to change her mind about burning it lol. I need to make room for another shed and a three season room, I might try move it and see how it does.