To start with you’ll have to suck it up with ‘easy’ rides whilst she gets her confidence up, but I’d say if she is serious then sign her up to a womens skills day; she’ll meet other women = confidence in itself and learn some skills from a third party, so you don’t cope the tears and aggro if she “can’t do it”. Also, she may find a riding buddy of her own to ride with, which frees you to ride where/how you want to. Once she has a bit more confidence on trails that are not just bridleways/fireroads, she’ll likely naturelly want to challenge herself by riding what you ride.
Give advice, but don’t “tell” her what to do – ends in an argument. I found that after the ride etc whilst having a cake and coffee is way better than at the time too, as it is a discussion rather than becoming emotional and potentially an argument; if you just suggest – “if you find something similar, try this next time” is good, “DO THIS. NOW” is bad. For you!
If she doesn’t want to ride with you all the time, that is OK as if she is feeling pressured she will likely not enjoy it and give up altogether. Also, means you don’t feel “held back” on “easy” trails to suit her ability and you lose enjoyment of riding because of that.
This is from the experience of teaching my wife to ski; me = 20+ years, her = hadn’t seen snow until 21 (Aussie living by the beach)! So paid for a few lessons so she could do the basics herself, and by the following winter we were living in Colorado, skiing almost everyday and my wife was hiking for steep lines and trying to get air with me, so it can definitely work!