M.L.
This might not be the same thing, but my daughter will go through periods where she just doesn't eat. Period. Maybe a little milk, maybe a few cheerios...but that's it, for the day pretty much. Usually, three to four days later, I then sit back and watch her inhale the ENTIRE contents of my pantry, refrigerator and freezer. Babies can go through stages like this. She's 6 months old, so it shouldn't be her "stubborn streak" coming out yet. Make sure you leave lots of things around that she could munch on while she's playing - sippy cups of water, especially. You don't want her getting dehydrated. You can keep little bowls of cheerios or other munchies around, too. My baby always ate...eventually. Sometimes it was the weather that set her off - when it's hot or humid outside, she's likely to eat a LOT less. Then, when the weather turns (I can't wait for Tuesday!!!) she'll suddenly suck up everything she can find.
I hope that helps!