Lavender's feed

Okay, I understand that her family felt uncomfortable/hostile towards her because their souls were switched, but do they feel any shame?

They straight up neglected Camilla and let her be bullied, isolated and made into a joke by society as well as always assumed the worst of her (and then later found out they were completely wrong).

If you realized your perception of her was wrong, and you changed your behaviour toward her as a result, how can you avoid feeling guilty about the way you treated her in the past? How can they act so shamelessly and expect gifts from her without even properly apologizing to her for everything they put her through?