Hunger strike

After three weeks at daycare with no problems, Miss M decided to go on a hunger strike. Friday she was sent home because she wouldn't take a bottle, and our provider thought she was sick. Of course, as soon as she got home, she took a bottle from dad, no problems. The weekend was also pretty routine, although we did brave the mall crowds Saturday. Turns out, if you have to step foot in the mall a week before Christmas, 8:30 Saturday morning is a pretty good time to do it. We got in, got around, and fed Miss M in the Sears dressing room before heading home. She didn't nap a lot, but that's normal at home. (We're not sure how our provider gets her to sleep so much at daycare.) Then yesterday, she again refused the bottle. Five times. When I picked her up, she hadn't eaten a thing, and our provider said she cried the entire time she was awake. (Two 45-minute blocks.)

I'm at a loss. She nurses normally, and still takes a bottle from dad. In fact, we fed her one of the bottles she refused yesterday, so we know there wasn't anything wrong with the milk. Nothing's changed, except her desire to eat at daycare. What gives?