i'm not sure what else you can do to find her, but what i did for my corn to keep him in, was make some straps to go around his tank. he has a slide lid tank now, but i use still use them. i went to walmart and bought some nylon straps in the sewing section, and some of those 3 prong clip things like on a backpack and made some straps to keep his lid on and it works quite well. hope you can find her!