Moore sheds a significant light on this period, by telling us that, about this time, Byron was often drunk, day after day, with Sheridan.

There had been insanity in the family; and this was the plea which Lady Byron's love put in for him.
She regarded him as, if not insane, at least so nearly approaching the boundaries of insanity as to be a subject of forbearance and tender pity; and she loved him with that love resembling a mother's, which good wives often feel when they have lost all faith in their husband's principles, and all hopes of their affections.

Still, she was in heart and soul his best friend; true to him with a truth which he himself could not shake.
In the verses addressed to his daughter, Lord Byron speaks of her as 'The child of love, though born in bitterness, And nurtured in convulsion.' A day or two after the birth of this child, Lord Byron came suddenly into Lady Byron's room, and told her that her mother was dead.

It was an utter falsehood; but it was only one of the many nameless injuries and cruelties by which he expressed his hatred of her.

A short time after her confinement, she was informed by him, in a note, that, as soon as she was able to travel, she must go; that he could not and would not longer have her about him; and, when her child was only five weeks old, he carried this threat of expulsion into effect.
Here we will insert briefly Lady Byron's own account (the only one she ever gave to the public) of this separation.