Tuesday evening I noticed the spider had another ant in her arms, in the middle of her web. I blew at her, to see if she was comatose from ant blood or possibly dead, and she scurried up to the corner of the web nearest to the corner where the ladies' room walls meet. She dragged her ant package up with her, and attended to it at the top of the web, where she'd be less affected by the wind. I wondered if she'd leave this latest ant with the six others. The next morning I noticed that she had. So now there are seven ants wrapped up in the corner of the ladies' room where the single row of vertical tiles meet the wall.
It occured to me that a spider's life is like that of a military patrol. She waits and does apparently nothing for days on end, but is always ready to spring into action for a kill. Then return to dormancy.
My husband's guess is that the ant stash is for baby spiders to come. I'm pretty sure that all we know of the natural history of spiders was learned from Charlotte's Web.
I hope the cleaning people don't get conscientious and clean up her stash, or her. I'd like to know what happens next, and that will possibly take a number of months.