Is it true that Chinese has to have a visa to go back now if she has Green Card for US?

My wife is Chinese and has a legal resident Green Card and is still a Chinese citizen. She has been travelling to china and back the last 4 years using her Chinese passport and Resident card as identification.

She was informed, by some friends that there is a new restrictions saying that she now has to have a visa to go to China and come back. Is this true?