You did the right thing. I don't like anyone else driving my MB either, exceptions are my g/f (who doesn't care for the W126, let's see if she likes the W115 better!) and beyond that, my folks.

For all they've done for me, they are welcome to try out any car I've owned. Rarely has the offer been taken up, though (Audi 5000TQ gave my dad an odd smirk!).

be patient and let your mom enjoy the 123!

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1985 300TD
1984 380SL
1983 280SE (full Euro, trunk triangle and all!)

Formerly owned:
1986 420SEL
1984 300D
1983 300D
1981 300SD
1976 300D