2 minutes is a long time to have a garage door open before closing if you are walking in.
Let's assume this is a rounding error and it is closer to 1 minute 31 seconds to round it up.
Regardless, you raise it and walk to the control near the interior door and that is only like 20 to 30 seconds.
Did the family stay for that minute until she closed the door? Or did they drop her off in the driveway then go on about their business. I doubt that.
All of this is wondering if the perpetrator gained access to the house thru the open garage or if access was much later in the early morning when the other activities happened?