The fact that this episode happened in a place of worship should not add to its gravity, but only highlight the readiness of the tension in this relationship. I'm sure it didn't help in upsetting the mother for Susan to call her on something like that (Susan's not being complimented on her own jewelry by her own mother) in such an intimately public place. But feelings of not receiving love from a mother (at any age) can turn into irrational and regretful episodes easily, and we need to try and be patient with one another when we recognize that our feelings (especially those feelings with a history, half-buried) are so near the surface, and so raw to being stung.
It is good when feelings come to the surface, I think, even if it is an instance of anger or even (God forbid) a willingness to hate. What is necessary is to recognize them as meaningful, and to recognize as well that each person involved is responsible for these feelings. But if Sharon wants to grow and turn this episode into a new day, Sharon needs to be able to understand, on an emotional as well as a thoughtful level, that her mother might not always be able to love her in the way that she thinks she needs, and that that is not her fault, and that she cannot demand that of her mother.
Let me add this thought: we learn how to love from each other, and if we haven't been loved first, odds are we will not know how to love either. And yet we are commanded to love (what a command!) -- even our enemies. (Though I sincerely hope that Sharon does not see her mother as an enemy!)