I would echo what blessedrhiannon said: it's out of character for you to just not show without at least calling or cancelling.
I never just "not show" except when I am physically unable, or in the rare instance that my schedule with T has changed and I forget that it's not on our normal day. This happened once last year, and my T did the same thing. I totally spaced on having switched to an earlier day that week so I didn't show. T called, and then I had a doh! moment.
As BR said, you have every right to ask T not to call even if you forget. I think T was just checking because it's out of character for you simply to no-show... But def. talk to her about it.
How was your scrapping weekend otherwise?