Hi
No real advice about passing her test as my wife took hers 14 years ago and it's all changed, I suspect.
I would, however offer up a little advice about afterwards, should she be successful.
My wife took and passed her test with 3 other woman and is now the only one of the group still riding.
2 of them bought sports style bikes, guided by their boyfriends and the other bought a Harley style. Both these types of bike are harder to ride than a roadster. Unfortunately their boyfriends were very impatient and encouraged them to ride faster than they were able. They also still rode with their mates and just brought the wife along which caused tensions. After a while the girls lost confidence and either went back to the pillion or indeed split up!!
I bought a old VT500 for £200 and told my wife it didn't matter if she dropped it. I then spent 6 months tootling around just the 2 of us. I never went too far and always made an enjoyable day of it stopping for a nice lunch etc... It's all about building up nice biking memories for her so when it does rain she knows it's worth it.
There came a day when suddenly she just got a bit faster and it all flowed a bit smoother. She then bought a 6oo Bandit and started commuting on it. She took her first trip abroad in 1999 and we went down through France as far south as 80 mile east of Madrid.
She's a seasoned biker now (TDM 900) often more experienced than middle aged men we meet on the continent. This year my bike broke down for a couple of days in the Alps so she took me pillion for a day over a Col and round a Cirque and I'm 6'4" and 16 stone (and she's no spring chicken

).
Hopefully your wife wants to and will pass her test, that bit's up to her. But weather she stays riding a bike; well in MHO that is more about you and your attitude. Be patient for a year or so - you've waited this long.
Believe me it's worth it.
Good luck to you both.
