What do you have on the top for her to cling from?
Having some sort of webby fabric (such as the netting from some wash-cloths, that's what I use anyway... the netting, cut from the washcloths, then my mom yells at me, hahaha, jk I just got them from a dollar store) on top is one idea.
Anything that can be better than a paper towel would do. D. lobata, from my experience, have strong, sticky feet. The 5th instar babies I have, in some of their cages there is still a leg from their molt that is still attached to the top. The ones I raised last year never needed anything more than paper towel, but did need quite a bit of room.
On the complete opposite side of things, the Violin mantis I have was a pain in the butt when she had to molt to adult. Two of her legs couldn't even stick to anything, and her two other legs could barely stay on a branch. I ended up using scotch tape and then held two of her feet in place with my fingers for a good half-hour to make sure she molted alright. She is doing well and is quite strong, very beautiful mantis too... so if it must come to doing this for LOL, I am sure it will be worth it. If it doesn't work, at least you tried. (Believe me, this wasn't the first time I had to tape a mantises feet to prevent a fall, but this was the first time it actually worked)