There's a lot of fantasy that has female and male wizards. Terry Pratchett's Equal Rites centres a lot on it. There's also other forms of media that embraced it. Wizard of Waverly Place, for example. It was a Disney show where every person, girl or boy, with magic was called a wizard. Honestly, I think it's a really fun idea. I think you could really play around with whether wizard is just the accepted name for anyone with magic, and why that is, or if women want to be known as wizards for a particular reason. Is there a difference between a wizard or a witch or sorcerer or is it just used as an umbrella term for all kinds of magic? Either one, or any other idea for that matter, is fine.