-Yes. She needs to file I-407 to the US Consulate in China after she returns to China. See:
https://china.usembassy-china.org.cn/visas/immigrant-visas/us-citizenship-immigration-services-uscis/abandonment-status-form-407/
另外目前她護照上還有10年簽證,如果想再來美國探親有沒有問題呢?
-This visa has been void after she got the green card. However, after she abandons her green card, she can apply for a new B2 visa again.
謝謝您!