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I think the conversation of her being a slut etc was a different one from the one after her last performance. In the one where she says she's a slut, he says something about her being brilliant but needing time off. In the one at the end, he storms in and calls her a monster - a brilliant monster.. something to that extent.
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Metatron: You people! If there isn't a movie about it, it's not worth knowing about, is it?
She had just ended her affair with Tom and was down in the dumps. It showed in her performances. Her husband called her on it and she got angry. After he explained he wanted her to go away and rest then start rehearsals for their new play Nowadays she calmed down. She said "I'm a slut. A bitch. An awful bitch through and through."
He then replies "Nevertheless." Cracks me up everytime. LOL
"My left hand hasn't seen my right in twenty years." JJHunsecker
I'm sorry to be such a stickler, but this too was one of my favorite scenes because of these lines.
When she bursts into tear after realizing that she is overacting because the "outside world" has "cheapened [her acting] gifts", SHE says "I'm just a slut, a rotten bitch."