Not, of course, that Elly can admit this. While it's happening, Elly interprets the baffling tendency her children have of wanting to get in the way of her being herself not as the sign of insecurity it actually is but as their hating the idea of her wanting to be herself. When the end result of all of this shrieking and growling about how they have no right to her time is brought to her attention, the tendency she has to avoid seeing herself as the primary (if not sole) cause of the chaos in her life makes her say that she actually was a loving mother who always made time for her children and only lost her temper on very rare occasions and that only when she was provoked.
This, I should think, is part of a generalized pattern the Pattersons have of not remembering when they've failed to live up to their self-image. While Elly can occasionally admit to herself that she'd shortchanged herself by misreading the situation in a ridiculously self-serving manner, losing her temper too readily and not getting her facts straight, she spends far more time forgetting that she exploded with pointless rage because she didn't actually know what was happening or why. This is because Elly doesn't want to admit that she doesn't actually have any idea of what's really going on around her and would prefer to not really know lest she have to lose face.