Maybe you could construct something like what I have.




I don't have any good pics of the "cage" itself, but you can see it's just made out of small PVC pipe and connections with some fencing wrapped around it. The one I have is only 4' x 6', but that's really all the room I have for it anyway. Since it's made out of PVC pipe and the fencing is attached with removable wire ties, I can take it down and move it or store it whenever I want. It also has a top which isn't shown in these pics because neither T or P could jump out. I do put the top on now with CJ though.

I got this through http://www.catplaypens.com but unfortunately the site doesn't work for me anymore so I don't know if they are still selling them or not. It was less than $100.00 for the 4 x 6 pen including all the PVC and fittings that were needed, the side fencing, some top fencing, some fake grass for the bottom which I haven't used yet, a tarp for the top to provide some shade and a bag to carry it all in.

I know others have built bigger "cat runs" using regular 2 x 4's and chicken wire type stuff, so maybe this would be an option to let Hannah out without you being overly paranoid.