Don't know he told Carlo There's a car waiting for you outside to take you to the airport. I'll call your wife, to tell her what flight you're on like she had gone ahead and was already in Vegas

I reckon Connie's return and confrontation with Michael, happened within a couple of days after the hits

no rocket science! Michael! You lousy bastard -- you killed my husband! You waited until Papa died so nobody could stop you, and then you killed him. You blamed him for Sonny -- you always did. Everybody did.

I too reckon, the moving van and packing up the house would have already been arranged as they knew they were leaving