I read that this morning and was wondering how on earth she couldn't feel that there was something there

Surely even a small bat is quite a noticeable size.
I don't think I've ever put anything on with a creature in it, though I did once try to slap the ant that was crawling up my back underneath my t-shirt, only to disover it was a wasp. For some reason it didn't take kindly to being slapped and stung me. Twice.