Immigration Law Questions? Ask an Immigration Lawyer.
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Not while she is a greencard holder. However, once she becomes a US Citizen, then she can petition for them by filing an I-130 application for them - see HERE.
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Sorry, but no. To petition for your parents (mother or father) to live in the United States as green card holders, you must be a U.S. citizen and at least 21 years old. Green card holders (permanent residents) may not petition to bring parents to live permanently in the United States. Source: www.uscis.gov/family/family-us-citizens/parents/bringing-parents-live-united-states-permanent-residents
The link you provided (www.uscis.gov/green-card/green-card-through-family) is generalized information and is a bit misleading.
Greencard holders cannot petition for parents. US Citizens can.
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