There are a couple options for you that you can consider.
One is to not open the lid all the way; just open it enough to sneak a hand (and therefore food) in. That increases the likelihood of an angled strike against the versa-top if she chooses to jump, but also increases the likelihood of her flight being aborted and her landing back in the tank.
Another is to rig some kind of netting using the versa top to hold down one end. That way, you can work your hand under the netting, but the netting will keep her from actually escaping. Of course, there is a slight chance of her getting stuck, but if she's *just* jumping when you open the top, then you'll immediately see if she's stuck.
If you have a HOB on the tank, I can't remember and didn't see any mention of filtration in a quick look back through the thread, you can also try dropping food into the water returning to the tank. Nothing opens, so there would just be food automagically appearing in the water.