Joanna dodged the woman's punch and moved away. If she had wanted to hit the woman she would have landed a blow on her right leg and made her unable to use the leg for at least three minutes.
That she only dodged without attacking wasn't seen as a good thing by Grandma Cora. Instead, her actions infuriated the elderly woman.
"You are nothing but a weak idiot that my daughter took pity on and raised for over 16 years. Let's see for how long you can continue dodging," Grandma Cora seethed and charged towards Joanna one more time.
As this took place those upstairs were not aware of it. And this was all thanks to Joanna's overwhelming powers.
She was able to block off all sounds from reaching upstairs so that none would know what was going on and come to Grandma Cora's rescue.