You believed her when she said she didn't want anything for Mother's Day? When she tossed in an "I don't know why people succumb to pressure from advertisers. It's so silly." What did she do when you said "Happy Mother's Day" and followed it with a sip of coffee? Your own coffee, to boot. Always the diplomatic one, Im sure she just smiled that radiant smile of hers.
First, we stop the bleeding: tell her its Happy Mother's Week, not day! Or some bullshit like that.
Get her a travel sized version of her favorite toiletry. Cute? Yes. Enough? No. Wrap it up with an airline ticket. Bon voyage!
She'll want to pack in style. Book me and surprise her with one of my newest services: Style: The Vacation Version.