@Leila427 So, you're both newbies with zero reviews. It seems fairly reasonable, for a solo female guest to be a bit anxious in the circumstances. (There are thousands of bad reviews on Trustpilot about Airbnb). She'll want to be sure you're genuinely a female host, for a start. So, I don't see any harm in temporarily adding a photo to your listing of you in the room.
Equally, you might be a bit anxious that the female guest is who she says she is, so I would sound her out to find out why she's visiting, ask if she's fine with the house rules, - whatever - create a dialogue whereby you'll both get a sense of each other.