Saturday morning meowing

I have a weekend dilemma. My cat, Grace, becomes quite agitated when I'm not out of bed by 7 a.m. - seven days a week. This morning with no commitments until later in the morning I burrowed under the covers. The clock told me it was 6:30, and I sighed in relief. Saturday morning and sleep I thought, but Grace had other plans.

"Meow" she screeched next to the bed. She continued until I responded. By 7:30, I realized I was not sleeping, and my cat was not going to be satisfied until the coffee began brewing.

How do I train her about weekends? In fact, how do I train her period? On Wednesday, I overslept until 7:15. Where was her meowing then?

Now she sits quietly in the window next to my computer gazing outside, her job finished for the day. I yawn and long to go back to bed knowing that I will put her on duty once again.