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"Four Eyes" is the nickname of a member of a gang of armed bank robbers, named that because of her glasses. She disguised herself as Velma Dinkley, and the other members of the gang disguised themselves as other members of Mystery Inc..
Her disguise as Velma is perfect, fooling the whole gang for a short time at close range, except that Scooby wondered about her different perfume.
Even though she is the moll of Muggsy, she flirts with any handsome men she sees, including a bank teller she was holding up. This caused her to be late in getting out of the bank and she got into the wrong car, the real Mystery Machine.