I am not sure this is much help (seeing that Nevy isnt at that age yet) but my dog is a big jumper and I use a baby gate to keep him in the kitchen. well we bought the one foot petal gate. You step on the petal on the floor and it pops open. You have to be at least 50-60lbs to open the gate b/c you have to push kind of hard to get it to open. Its a safety first gate. Ok anyway its very high b/c it opens instead of climbing over it. It's about 3 feet high. My dog cant jump it so maybe Alyssa wont be able to climb it. Just a thought....
Here is a picture for an idea of what I'm talking about.