In what sense is Mrs. Flint as immoral as her husband?

Mrs. Flint is mean, petty, and hard as nails..... just don't ask her to assist in running her household. She sends her slaves out to do chores dressed inappropriately for the weather, she spits in food so the house slaves won't sneak out the leftovers, and although Linda excuses her behavior as a resuly of her husband's unbending authority....... I can't let her off that easy.