the first thought that came to mind was Duct Tape....
hahahahahaah! A dear old friend of mine used to tell me that a person could survive a heck of a long time if they just have Duct Tape, Baler Twine, and toilet paper.
Yep! Duck Tape sounds like a winner. & it comes in lovely designer colors nowdays too.
LOL! My mom swears by duct tape & panty hose. I've seen her use panty hose as rope to tie things before. It was so embarrassing when I was a teen. Once I borrowed Mom's car (a classic, even at that time) and Mom had tied down her rattling air cleaner with nylon panty hose for a quick fix. I drove into a gas station to fill up & they popped the hood to check the oil for me and gave me the funniest look.
Necessity really *IS* the mother of invention.....
Miss Jenny sounds like she's settled into your home well. What a cute scamp she is! I've told many Cara stories before, but she was my big mischief pup and a great training ground for us. I found out later that Cara's dad could open just about any gate latch that the breeder tried. In fact, 6 mos after Cara & her sibs were born, there was an unplanned litter when he used his Houdini-like abilities to get to Cara's mom...again.
I like the baby latch ideas & I hope that you find something that works well. We've used the "layers of protection" idea that people use around pools (you know, like locking doors, then a locking gate, and a pool alarm) when trying to avoid problems. Maybe with Jenny if you can use the fridge & oven latches, and then keep the kitchen door closed too that may help. On the front door, replacing the door knob with one that she hasn't mastered yet, using a chain or flip lock above, and you can get little battery operated security alarms that just stick on the door that will go off when the door is opened (you can turn them off too when you want). They're only around $10 for 3 in a pack as I recall & they work really well. We've used them before here. Good luck & give that pretty girl a big hug for me.