The constraint is always raw material. She has no shortage of ideas or time in which to put them into practice. Hence, she is most avaricious in acquiring hearts whenever an opportunity presents itself. Having a stockpile means she need waste as little time as possible.
She matches her step. "Warning me? That's cute." Another step. "Warning me of what?"
Sudden concussive blast seems to be what!
Shade should be able to weather it, though.
How dare she.
Shade knocks her down in retaliation, and uses her speed to get over there and place a foot on the girl's chest before she can get back up.
She pushes down a little, just enough to make it hard to breathe.
"Do you have a concept what you'll do, now that you have your prey under your power?"
"Well, there's fun we can have with physical means - I am quite the fan of knives - and fun with magical - which requires a bit of finesse, but, well, there's always more prey about. Depends on which path you'd like to take."
Then the Yew Queen can show her all the many, bloody ways of physically terrorizing someone!
And then teach her healing, so they can start all over again.
"What should we do with... this?" She pokes the girl with a foot.
"Kill her or set her free, possibly after healing her. Some people like taking trophies from their prey, too, but that's your choice."
Shade looks over the girl consideringly. "I don't think I need a trophy. Nor, I think, do I wish to let her go free."