Sophia's position in her relationship with Ellie and Patricia is, on the one hand, that of a loving mother who would do anything for her children and, on the other, a faithful and virtuous wife. I'd say that's the main argument Sophia uses all the time with Patricia: I'm a virtuous woman and you're a little whore.
Here, Patricia seeks to morally support Sophia, to ease her conscience. After a scene with Sam, what will Patricia tell her: I was concerned for you, that because of alcohol you had committed a deed that you would never in your life be capable of, and you, hypocrite, were playing with the neighborhood teenagers.
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And Ellie?
Ellie is still playing, realizing that a relationship with a man is not the same as a relationship with a woman. She reacts harshly when Liam opens the bathroom door, or when Dylan forgets to close the door.
I don't think a scene between Sophia and Sam would go well for Ellie.
Plus Ellie likes older men, so something between Sophia and Sam will be awkward if not disgusting.
That's the message I perceived.