If you remember, Tara was like this with Jiji initially when she wanted a baby no matter what and she distanced everybody by seeing or hearing no evil about jiji which was why jiji found it so easy to manipulate Tara..
And now, she is being possessive about her son that she doesn't believe anybody can take care of her son except her..
Is it because she yearned to be a mother before she became one that she doesn't want to let go of her child?
Do you think her actions are very possessive bordering on being obsessive?