She adapted to non-water corrections too quickly. The first day, just hissing worked. Second day it stopped, so I ran at her while hissing. Third day she was ho-hum about that, so I added waving my arms over my head while running at her and hissing. Then that stopped working and she would just give me a "WTF are you doing?" sort of look.
I don't own a squirt bottle or water gun, and I don't want to buy anything new so close to moving, so I just put a little water in a cup. The problem is, that's too effective and has overwhelmed her poor kittybrain. She now thinks I'm trying to keep her away from her food bowl and won't go into the kitchen while I put her food down (and runs out if I walk into the kitchen while she's eating). However, the meowing problem is about 98% fixed in the evenings and 90% fixed in the mornings.
I'm really pleased at how quickly this issue has been corrected. It's time-intensive right now (I have to correct her every single time she meows no matter what else I'm doing at the time), but it's only been about four days and the issue is nearly corrected.
And people say cats can't be trained...