L.W.
I used to have the same problem. All we did was use a regular wood gate, putting one end between the spindles & putting a basket on the other side near the wall. Theres also a great catalog/web site One Step Ahead. The have a lg selection of gates, even ones for stairs. How does she react to a FIRM "no"? My youngest is quite the firecracker herself, so it takes some creativity! Good luck!