Actually, longer, denser-furred cats can be better for people with allergies because the dense fur keeps the dander closer to the skin. Of course, if the fur is long enough to be brushed, you'd have to wear a mask when brushing! And it makes perfect sense that, because of the e-collar, she could not groom herself, so there was far more dander on her than there normally would be. I am sure that she grew in charm as well as size during her two weeks with you, and she'll be fine.