I also think she is just as guilty of her son's death, after all she caused all that chaos by repeatedly intervening…
They both had their differences when she said she won't use her powers, she did stop for many years until the drought dragon came and she told him that she wants to help Meng Chu. She is not to blame for what happened to her child, I don't understand how you came to this conclusion.
In the mortal realm she was already willing to bear everything, if he had told her why he sealed her powers it would have been different
In the mortal realm she was already willing to bear everything, if he had told her why he sealed her powers it would have been different