A woman nearing 50, with a house and barnyard full of dysfunctional rescue animals, struggles with insane rage when her mentally ill husband leaves her for his psychiatrist.

This one is a little tough because you are giving us a lot. Turning 50, dysfunctional (Not sure what that means) rescue animals, insane rage, husband leaving with psychiatrist

Also, It would have more impact if it was ‘her’ (25 year old) psychiatrist her husband ran off with. He isn’t mentally ill just a jerk who has dominated her and so she has never been independent:
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When her husband and psychiatrist run off together, a codependent housewife must manage the family farm and the barnyard full of rescue animals all while facing a very lonely 50th birthday”