Just wondering if she has found a trap yet?

If not can she get close enough to put a clothes basket over him? Or rig one up propped up with a stick tied to a string & just keep a watchfull eye, when he goes under it pull the string to pull the stick out to close the basket. If the basket is heavy enough though so the cat can't push himself right back out of it.
Might be worth a shot though if she has nothing.