How old is she?
I think that they actually make those faces because the texture is so odd. My daughter liked the banana rice cereal. Have you actually tasted any of those "cereals" that they make for babies? I would make funny faces, too. Yuck.
It's probably the different texture, she's just not used to it. She'll get accustomed to it eventually. Davey did the same thing at first, but within 2 weeks was pigging out on cereal 3 times a day!