You're not reaching too far, although I wouldn't say he has adopted the pyschiatrist as a new model for his father, but that the psychiatrist could be viewed as one; as he is trying to indoctrinate him with ideas that are contrary to the narrators beliefs.
Marla is definately not just a girlfriend to the narrator, but I wouldn't say she is a mother figure exactly. I think she is more of a dysfunctional representation of women, possibly like the narrators mother - he never mentions his mother, just his father, except for once when he mentions them together. Though the fact that his mother fell for a guy like his father probably says something about his mother, since we can assume Tyler is a close representation of his father, and marla fell for Tyler. Marla also seems to be more of a threat to the Tyler pesona and the collectivism of all men; there is something very important about just having one female figure aswell.
Although, as a symbolic part of his rebirth, combined with the father-figure of tyler and the psychiatrist, I think it's a good assessment to say she is like a 'mother' to the narrator.
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