I don't understand leave it meaning in the bold sentence. is there any idiom meaning? or if not what it refers to?
Mrs. Warren was still trying to remember how long the girl said she meant to stay.
"I think she said as how she didn't know. We left it that she'd spend the night, and let me know next day if she nneeded the room any longer."
"What did she do for the rest of the evening?" asked Sir Robert. "She come down to the kitchen and had her supper -- just picked at it