Have any of you experienced a mother having no contact with her kids after filing for divorce?

My daughter pressed my son to call his mother, and he finally did last week. He hadn't had any contact with his mother since she left four months before. My son was getting depressed, and he was pretty angry. This call did lift his spirits, but he is still hurting from this, obviously.

My daughter also spoke to her mother on that call, for the first time since early September. She was also angry that her mother hadn't spoken to her brother.

My wife has yet to initiate a call to one of her kids since she left.