Yeah, it looks like it. I also wanted to include it; because drama is always good and it also gives Yavanna a chance to show she can get out of sticky situations and find her way back to the group on her own.

Plus it might help Legolas realize, how he truly feels about her even more...when he thinks he has lost her.

I think so...I haven't got it fully figured out yet. But it makes sense, given her powerful lineage of family. And since I want her powers to also grow as LOTR progresses, it's just the start of that.