A childhood belief about imaginary friends

(Sort of nervous to put this here because people are really harsh with ratings, but...)

I do have an imaginary friend, but she's not as interesting as some of the others. She is a girl, no particular age but a little taller than I am, with long midnight-black hair and indigo eyes named Mara (mah-rah). She looks like a fantasy character - her hair is thick and long and swirly, and she wears a dress the same color as the inside of a very pretty shell I found once, gray-silver with rainbow tints.
I came up with her when I was seven or so and going through a stage in which I thought I was better than everyone else and everyone hated me. I was also a very dramatic child, as evidenced by the fact that "Mara" means "bitterness". At that time, Mara defended and comforted me as I thought I needed, and I think she had brown hair.
In sixth grade I brought her back and gave her her current appearance, and she developed a teasing personality, though we're good friends and she is caring when I need it.