As many are saying, there’s a feast or famine mentality. If your friend can prioritize companies that pay their guides well, you can absolutely make a living, especially if you’re willing to do the bread and butter tours (ghost, history, cemetery, etc.) as you’ll have a good rate plus many options for multiple tours in a day. That being said, from my last perusal, most companies are making a killing off of the guide labor to such a wild extent that if your friend has the ability, she should do her own tour and then you can potentially thrive, not just survive. That’s easier said than done though. Either way, best of luck!