Thomas, the callidryas is certainly a female. There is a simple trick for this matter - simply wait till she is on the hunt or moves when lights go out then place a few suction cups (the ones you get with misters and rain systems) where she normally becomes dormant near the glass. After a week or so remove these cups as by this time she should have moved onto a new resting place. If she reverts back to the 'hot spot' then and to our amazement, hylids and more importantly amphibians in general are far more intelligent that we're led to believe. Give it a whirl to see if it works.

** edit snip the handles off the suction cups so they reside flat so you can open the viv door.