You have to go around the convenience store through the other side and then talk to her in the bushes.
The other one I don't remember exactly as there are multiple weird keys in the halloween extra.
There is one (bony key?) for the crypt outside, to the right of the mansion, another opens a secret room behind a bookcase you have to drag in the library, and the other (bloody key, I think) opens the convenience store all the way back at the start.