There are various girls in Michael Bay's Transformers movies. The most well known one is probably Mikaela Banes who is played by Megan Fox.
Rachel Taylor in Transformers 1. Isabel Lucas in Transformers 2.
Technically Transformers don't have genders but most personify him as a male.
That would be Megan Fox.
rachel Taylor is a girl of transformers
Transformers - 1984 The Girl Who Loved Powerglide 2-35 is rated/received certificates of: Australia:G
Mikalea Banes (Megan Fox)
a dude ofcource
Transformers 2 was called Transformers: Revenge of the Fallen. Shia LaBeouf played Sam Witwicky, Megan Fox played Mikaela Banes, Josh Duhamel played Major Lennox, and Tyrese Gibson played USAF Master Sergeant Epps.