Okay, true story. When I was about 5, I decided I would like to be a boy. I had a cousin that I thought was super cool that was 2 years older than me. He gave me his belt. It had a big metal buckle with his name on it. MIKE. I wore that dang MIKE belt everywhere for several months with a football jersey! It passed. LOL I'm a mom and all woman. My parents never made a big deal about any of it. You are inadvertently encouraging it by paying so much attention to it. Ignore it. Let her say her name is whatever she likes, don't try to talk to her about it. Just ignore it. Time will tell but it very well could be just like my Mike belt. A temporary thing.