Law enforcement sources tell us police went to an L.A. area hotel last week to do a welfare check on Selena's mom, Mandy Teefey, at a family member's request. We're told she was taken to a nearby hospital to get checked out, but not under a 5150 hold -- instead, she was voluntarily transported for treatment.
Sources with direct knowledge of the incident tell us Mandy had a heated convo with Selena that day about the reunion with Justin. When Selena revealed she and JB were in couples therapy, Mandy flipped ... realizing the relationship was going to be more long-term than she thought.
Mandy was released from the hospital the same day. We're told she's giving Selena space to figure out what she wants, but the fam already knows what they want ... and it ain't Justin.