如果令媛未婚且未滿21歲的話。規定是: Any alien who is the parent or legal guardian of a U.S. citizen or lawful permanent resident, provided that the U.S. citizen or lawful permanent resident is unmarried and under the age of 21. https://trumpwhitehouse.archives.gov/presidential-actions/proclamation-suspension-entry-immigrants-nonimmigrants-persons-pose-risk-transmitting-2019-novel-coronavirus/
Any alien who is the parent or legal guardian of a U.S. citizen or lawful permanent resident,
provided that the U.S. citizen or lawful permanent resident is unmarried and under the age of 21.
https://trumpwhitehouse.archives.gov/presidential-actions/proclamation-suspension-entry-immigrants-nonimmigrants-persons-pose-risk-transmitting-2019-novel-coronavirus/
另外 半年内要回国,注意机票很难买很贵的问题
你这种情况直接咨询美驻华使馆更合适