Hi,
Certainly you can ask her to return. Try to duplicate the conditions when she first appeared.
Ask her who she is. But keep in mind such moments are gifts --you're wanting it will not make it happen, so no use putting much will power or anguish into it.
Similarly I used to see such ideal faces a week or so previous to when I met them human form. In life they were slightly distorted, by life I guess, but they closely matched. Now I think they were old friends, members of my Disc Family who were passing through my life. None sparked enough response from me to be my 'soul mate,' but we did share a sense of deep fondness. So perhaps you'll meet her on the earth plane, but possibly in a less perfect guise.
Or she could be your 'anima,' Jung's term for your Higher Self in its female aspects, just checking in to remind you that the quailities you see in her are in you.
Along with what others on this thread have said, some eastern philosophies say to not get too caught up in it, just let whatever it brings flow into your life. Accept it as just one more aspect of the spiritual--you're probably going to meet many such new experiences when you are ona spiritual path!
Bets