Hi Zetti,
I do not speak Russian and I can only make assumptions.
I think this time the reason is sex.
Em tried to do it in the morning but Sid rejected her.
Later, Em tried again when he sat on top of him, but Sid was indifferent and she shouted something to him.
Shortly afterwards in the GR, Em tried again but Sid must have said something bad because she was about to cry.
Then, in the kitchen, when she saw that Sid still cried like a fool, she did not stand it anymore and cried again.
Em, like all of us, is asking herself what Sid wants.