Her green eyes, blonde hair, and blue ribbon show she is: Saber - Maid [Fate/hollow ataraxia] But her maid costume is: Saber (Rider Alter) - Maid
She didn't pay attention to the details and merged both characters into one, if she wanted to be Saber (Rider Alter) - Maid then her eyes should be yellow, have white hair, and have a black hair bow ribbon.