It is called ball lightning, so you’re right!
I’ve never been lucky enough to see it, but my mother had an eerily similar experience to yours. It was years before I was born, and she was feeding my older brother in his high chair in the kitchen when a ball of blue light the same size as yours came through the kitchen window, hovered a bit, and dissipated. She also said the air felt electric.
Nobody believed her until many years later.