For many people, competently applied fitting "rules of thumb" are all the fitting they need. So if you are reasonably confident in your methods, I would help her set up her saddle and reach, cleats, etc and send her out on the road. If she is one of those people that is athletically adaptable, she might do very well.
And, it is much harder to perform a real studio fit on someone who has no idea how anything should feel.