She's also conniving and manipulative the way she makes Jane go to Netherfield, knowing it will rain, that Jane will get sick, that they'll be obliged to keep her there, etc.
She is shallow-minded because she was all worried about Lydia running away until she found out Lydia was going to get married. Marriage fixed everything. She wasn't embarrassed about the way in which her daughter's "scandalously patched up marriage" shone a bad light on the family reputation.
I just think of SJs as socially proper people. They are the traditionalists. The stalwarts of society.