Hey, stefi91, and again, welcome to Psych Central! I agree that your mom's drastic personality change likely shows that she has some sort of brain "illness" that is affecting her ability to control her thoughts and feelings. And she needs to go to a doctor pronto. I hope someone in your family or one of her friends will help you out in getting her there. She is not very likely to want to go on her own, believe you me!

All that said, I know it will be hard, but remember that this lady is not the woman you knew from the past. Her hurtful words and behaviors are not what she would be doing and saying, if she were okay.