Almost. The wording you are looking for is:
By asking "do you know a place I can crash" instead of "can I crash at your place" you don't put any pressure on her, so if she doesn't want you on her couch, there are no hard feelings. And if she does want to host you (and it's likely that was her intention all along when the invite was sent!) she can just say "yeah, you can crash with me"."Hey. Saw you invited me to this haunted house? Sounds cool. I'd love to get back down there and see people again. Do you know where I can crash a few days since I don't have residency there?"
As an added bonus, if she doesn't want to host you, she is now forced to refer you to someone who can.