Heaven could easily let things slide, especially some petty and pathetic people like Mrs. Deng.
When Dominic moved his family to the penthouse after that incident with Andrea Ng, only a few servants came with them. Mrs. Deng and most of the servants stayed in Dominic's mansion to take care of it until Dominic and Heaven's matrimonial home finished its construction.
However, with Heaven's sudden pregnancy, the Zhu family thought having more servants around would be better. Therefore, many from Dominic's mansion moved into the old residence to help, including Mrs. Deng.
Heaven didn't put too much thought into it even when Mrs. Deng would start with her subtle lousy treatment toward the young madam. She could be petty over other things, but not with this one for the mere reason Mrs. Deng was too pathetic to give her attention.
Until...