The Zhu Family gets together in the old residence a few times a year. It was already a tradition in the family and everyone was often there. Heaven attended to a few of them until she found all sorts of excuses not to. Dominic bought all the excuses she said in the past, not forcing her to go with him. Even so, he would always mention it to her out of formality.
To be fair, the immediate family members in the Zhu Family — except Axel — were all welcoming toward Heaven. However, the relatives weren't much. Although they didn't have the cheek to pick on her right in front of Dominic or Grandma Zhu, they would never fail to bring up Dominic's childhood 'sweetheart'.
One could guess what sort of things the original Heaven had to listen to, making her insecurity and negativity grow worse.