It's her car alas! It's when she's approaching, suddenly realises she can go, and puts it into 1st gear even though she's doing about 20mph at the time - LUUUURRRCH!
I cringe when my wife is driving and comes up to a roundabout, hesitating when she doesn't need to. I tend to read the situation beyond what cars are actually at the roundabout, and enter it smoothly and without un-necessary stopping, but she lurches about. I can't say anything of course...