IMO, we will likely find out that Maddie was an introvert and kept to herself and unlikely that she visited friends or had friends over.
This reminds me of another teen from my hometown. Janell disappeared shortly after her 16th birthday. She supposedly left in the middle of the night with her stepdad to help a friend who had broken down. Stepdad and mom are now awaiting trail for her murder.
I'm not accusing Madeline's mom of anything. Simply sharing the similarities-disappears after birthday, last seen with mom's partner.
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