It seems like the vine is just another friendly vine, not out for murder of any sort. Most certainly it wouldn't challenge Harley, especially with a flaming sword in her hand. Fire and plants not do mix very well, after all.

It's only once Harley get a few feet off the ground that something starts happening. There's a quick sound of wind that travels past her, and she might see an arrow coming from the corner of her eyes. Back on the ground, two satyr stand, shooting arrows at Harley, while a familiar girl stands behind them. She's carrying a spear behind her back, a grin on her face while she watches them try to knock Harley down.

If they don't do it, she'll have to get her own hands dirty.