Hmmm, I don't put that much thought into it.
I've got two steps at my house, depending on direction of travel you either go up or down, they don't move and have been there longer then the boys have been alive. They've wrecked themselves on those two steps more than anything else. Climbing trees and fences, riding bikes and motorcycles, playing in the woods...a trampoline.
I'll tell ya what's dangerous, tether ball! Somebody gets it in the in the face or a rope welt every time! No more tether ball for this family.
Sieg you know your daughter, if you don't think she's fit for a trampoline or her friends are rowdy, than maybe start her off with a helmet and one of those bouncy balls!