So I did a little research, and this is what Bella had to say about her mother...
"
While they seemed really happy spending time together, Thorne's relationship with her mom has been complicated at times, as she revealed on "Strahan and Sara." Thorne said that she wished her mother had provided her more guidance and rules growing up,
"I wanted acceptance," Thorne confessed to host Keke Palmer. "I wanted appreciation and love for who I was, the way I looked, to everything about myself that I didn't ever feel like I got."
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What We Know About Bella Thorne's Mother - The List
She also claims to have been sexually abused as a child.
You add that up, and it's not completely out of the realm of possibility that she behaved like that. Broken parents, raise broken children.