I hadn't realised, is this website American based? I live in the uk and both your suggestions, TXmom and waffles', are great but I'm not so sure the products are available over here. I will look for something similar though and they have given me ideas to go by. The coyote rollers aren't available here because I came across them during a desperate google search before when thinking of changing the gate to no 3 and can't for the life of me find a website that sells them here. Coyotes aren't a problem in the uk, thankfully, so I'm guessing not much call for the rollers!
Waffles yes you are right, if I make the gate impossible to climb she most definitely will climb or find another way out! Our garden is enclosed with a 4ft stone wall all the way round. Half of it is topped with a high wooden fence ( which I am positive she can't jump/climb over) A quarter is the same but it has a lethal drop on the other side of it into a field of about 12ft. The last quarter of the fencing is chicken wire topped with barbed wire, and this has been the way she escaped in the past but I made a make shift barrier to stop her from getting to it so now she jumps the seemingly impossible gate no 3!!
I am at my wits end! It's a trait that I know she will never grow out of and it's nearing lambing season over here now, I am surrounded by farmland, so the urge to go is stronger than usual!! Complete nightmare!
Thanks to you both.