It was recently suggested to me that when attributing dialogue after a quote it should always end comma close quote lowercase, as in:
"That's what," he said.
However, if the character speaks in complete sentences is it ever correct to end full stop close quote?
"...with a pound of grapes and nothing more." She said.
It would seem correct to capitalise after a question such as
"Where do you think you are going?" Said Mother.
Is there an accepted convention here that I am unaware of or is the second example always wrong/right?