Probably headset, GB Stem, Maes handlebar (there's nice, quite fancy collar under the tape by the stem clamp area), seatpost and saddle, Weinmann brakes and levers, gear shifter (looks like early Huret). I'm not sure about the right crank arm and chainring that look like Specialites T.A. Cyclotouriste. Were they made in 50's? Usually cranks were cottered. Wheels usually were 32/40 spokes.
Rear derailleur and Silstar crank arm is later addition.
Maybe that old lady got it just after in-shop repaint?
What are you going to do with it? Restoration?
It's very nice bike, btw.
Cheers,
Piotr