vinegar... yes it makes sense, provero'.
My DD is very similar she def likes to please and hates the opposite. so even when she tries to rebel is normally a very short-lived attempt - she's so worried to be in my bad book, which, like you say Franca, is not necessarily a good thing. she also takes the piss at bedtime like asking to go to the toilet for acqua, wee-wees and po-poos and whatever she can think of a million times - like you hothell I let her win once. she has not realised yet that she can get out of bed (thank god) so she cries but doesn't move and eventually goes off.
dh never loses it either, but that's only because he only experiences an 'abridged' version - grazie al cavolo! he thinks it's fair that sometimes I shout. he always backks me up and viceversa although I do have to remind him to tell her off.
tomorrow DD, DB and myself are going here