Hova- I've been looking for those 80# luggage scales at Wally world ever since you mentioned it and I swear I can't find one??
Shakes- It doesn't matter if it's perfect or a masterpiece to your little gal there, she will love anything that resembles what she saw on TV. I think you got a little fire burning there and you should definitely fan the flames!
I built my 2 nephews Osage longbows for Christmas and the 8yr. old Tucker got a 23# @24" and the 6 yr. old Garrett got a 15# @ about 18" and they are perfect for them at this age. I know they will outgrow them shortly, but boy they sure are having fun with them at the moment. Tucker is quite the dead eye with his and he asks me constantly....."Can we go shoot my bow uncle Chris?"
I even took them stumping the other day and they had a blast!
Here's some pics of them tearing up my 3D buck targets.
Look at the target, not the camera!