Standing back with slightly wide eyes and listening to her ramble, Remus felt himself begin to grin. This girl was insane and he found he liked her the more for it.
"Yes, Sirius is at Hogwarts," he said, gesturing to the den and inviting her to sit down. "He's taking all this rather hard, I think. He's not responding to my owls and he hasn't been back here in a week. I have a feeling he's trying to hide from it all."
He flicked his wand, setting a kettle to boil in the kitchen for tea.
"He doesn't spend much time here anyway. Only weekends and to look in on my after moons."
Subtle hint #1. If she didn't know, he hoped this would be an easy way to just get it out there.