This passage is from The Children's Bach by Helen Garner:
Some things, Morty,’ he said, ‘strain a person’s sense of humour.’
He swept through the room. The three of them sat foolishly, with fading smiles. It was dark, and the rain had stopped. Vicki stood up and switched on the lamp in the corner: the disorder of the room, its stuffiness and neglect, would have made her feel guilty had she not been already half drunk: as it was, she witnessed minor twinges of the appropriate emotions occurring distantly, as if to some other girl in a similar circumstance.
Does "as it was" mean "because she was half drunk"? Does the whole part in bold mean, because she was half drunk she felt some real emotions (a sense of pain) that she imagined it is occurring to a girl far from her and in a situation like her and not to herself?