Sure, she's an adept climber!

Vivianne took off her shoes and her stripped knee-socks, as the boots would make the climbing difficult - and she would probably make her socks dirty if she'd kept them on. She had no problem leaving them here; she'll return for them as soon as she gets the access card.

Skillfully, she climbed over the balustrade. There was only one branch thick enough to carry her weigh. That was the trickiest part, but Vivianne, being short and subtle, yet quite fit, managed to get to it. From there the path to the main bough was a real piece of cake.

A surprise was waiting there for Vivianne: a loudspeaker attached to the trunk of the tree! She laughed. Well, at least some of the wailing sounds wasn't really made by the wind, but by this piece of technology. She inspected it closely; it seemed silent just now.

"OOOOOOUUUUEEEEE!!!" While she was looking at it, the loudspeaker produced an extraordinarily loud shrill. Startled, Vivianne bounced back, tripped and slipped down from the bough!