The reason Samantha couldn't be in And Just Like that is because, immediately after the events of the show, she had a child, Mia, who she'd been raising as a single mother for the last 20 years. And during the events of the show, she was planning a grand wedding for Mia. Unfortunately, her daughter discovered the 3 men who had sex with Samantha around the time she was conceived, but neither knows who the real father is, so Mia secretly invites all 3 to her wedding, and antics abba ensued. And just like that, there were 3 papas and one mama for mia. So Samantha couldn't go to Bigs funeral.