My theory
The movie seems to go from 3rd act to end of movie skipping everything that should come between them... it just says, na we don't need to do them, we'll just cut to the ending, and make it so no one really knows wtf happened, what she throws into the water, why the cops didn't drag the river looking for the baby, I mean none of it really makes any sense in the end.
What I think happened (Spoilers)
Well Theresa and Jon explain they always get what they want, what they wanted was to destroy her...
Momma in the end must have thrown the cat into the river
hence the cat being gone
not the baby
killed herself because she knew she wasnt fit to be a mother
and left Jon and Theresa with Peter
and it was all done to convince Justin so he would leave
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