Ask what she's comfortable spending on components...leave the high cables out of it. Show her some good quality equipment that will be reasonably reliable. Does she have a record collection she's been storing for future enjoyment? Or does she prefer the ease of digital formats?
For mobile listening with a phone, suggest some great noise cancelling earbuds, like those from Jabra. Does she work out? Need water proof/ sweatproof, that will accept incoming phone calls with out a hitch, and can even work as a hear-through noise cancelling device that you can leave in the ears?
Treat a prospective female customer with respect and patience, and you'll have a longtime repeat customer. Young women are busy these days, as are young men, under 35-40, with young kids...who typically don't have lots of time or patience to assemble a prized music system, and many young families will opt for a home theater system as a gathering centerpiece.
Truly highend audio comes a bit later when the responsibilities shift away from raising kids through high school and college...and vintage audio from the 70s is huge right now. It can be a starting point for future high earners. It's what their parents listened to growing up in the Golden Age of Hi-Fi.
Women are not dumb...and typically have more acute hearing than men. Female "audiophiles" are a bit more practical about the gear. Performance/value has been my experience...but they need to be able to hear it to justify it.
Patience.