I think you should start her driving asap under your supervision so she has practice.
Dont get me wrong, but I love my w123c, but If I had it to do over again, I would have gotten a w124 like my brothers. THey got their cars for 10k a few years ago. Mine was 1600 dollars, but I have close to 8 grand in it already, and I am about to do a tranny rebuild, steering rebuild, and engine rebuild just to be safe because my car has a lot of miles on it. I dont think I will ever sell it.
No Benzes in the stable at the moment, but itching for one again.
Former Mercedes in the Stable:
1983 300CD Turbo diesel 515k mi sold
1984 300CD Turbo Diesel 150 k mi sold
1982 300D Turbo Diesel 225 sold
1987 300D Turbo Diesel 255k mi sold
1988 300 CE AMG Hammer 15k mi sold
1986 300E Amg Hammer 88k mi sold
1992 500E 156k mi sold