[quote=@KatherinWinter]
[@Gentlemanvaultboy] Birds? That's a new one. What's the limitation?
[/quote]

Honestly? I imagine if she stayed in one place long enough, under enough stress, you would get a carpeting of birds expanding beyond the horizon. But that would take a long time, and a lot of stress.

The longer she stays in one place, the more birds show up until they cap out. The more stress she's under, the higher that cap becomes. Big birds only show up as a direct response to her life being in danger unless the cap is really high, at which point they'll start showing up like regular birds.