The basic idea is simple if a cat can get their head through than they can get the rest of their body through. Good luck getting your her out hope to hear good news soon
OK so I spoke to the HVAC guy and unfortunately didn't get anywhere. The way our house is constructed, the ductwork is sealed between the floorboards and a layer of insulation, and it's all one piece. So taking it apart would be a major construction project, which now I'm seeing a little more clearly. So I don't blame the HVAC people for not being able to help, because clearly the way our house is laid out there is just no way in through the ductwork.
The HVAC guy, however, feels quite sure she will eventually come out. Clearly she knows the way out, since I saw her at one of the openings this morning.
The thing that has me most concerned, however, is if she can actually physically get out. I've just been going on the assumption that if she could get in, she could get out again, but my husband is not so sure. Does anyone have any reassurance? Just how contortionist are most cats? She's pretty small but not tiny (she's about a year old) and it definitely looks like a tight squeeze for her. However it's not like she's been hanging out at the exits crying because she can't figure out how to get out, either.
Gah. I am out of ideas. Stinky tuna didn't work, cat food didn't work, string didn't work, catnip didn't work, calling her didn't work ... I'm really starting to feel like she's got her own colony of mice down there and she's not coming home until she's finished them all off ....