This series messed me up! :) I have nothing againt staying at home and love good portrayal of stay-at-home-mothers on TV. I meant for Che, Mirandas work didn't matter (I should've put the "housewife" in quotemarks)
I feel that Mirandas' attitude towards her profession used to partly define her (not in bad way). But in AJLT I only saw Mirandas excitment over her new studies in first episode. Later it was replaced by obsessing over Che. Che, while claiming to love her, didn't think twice to presume she'll give up a perspective internship to come worship them in L.A.
In the end, I felt, the studies Miranda started was just one of many things she was trying to change in her life in order to not be so unhappy and misarable she claimed herself to be.