Kristen Di Donovan

I know that Theresa Donovan is Theresa Donovan. But still, with how Brady had put it out there that he apologizes to her in calling her a bad mom & when Victor had died, one of her memories was when he realized that she truly loves his grandson, Brady by sacrificing herself back when, but the Theresa we are seeing is proof-positive that she’s worse than Kristen on a bad day, with what we have been seeing lately, so why the vast change?