I am just going to add about the overnight thing
I am in a relationship
together we have 4 children
I would never take one overnight anywhere and just leave a note

I would make sure that they knew where we were so they wouldn't worry

it is kind and courteous and the right thing to do...who knows if she found the note or when she found the note

I know that I would assume something bad happened because I would never assume that Cori would just take one of the kids overnight without letting me know...in person or on the phone...voice confirmation