going to india

I am a US citizen and my mom came to stay with me during the pandemic ( 2021) and 2.5 years later, we finally received her Green Card + SSN+ EAD + Parole documents in Feb 2024.
Since we had been waiting for her Green Card, she wasn't able to go back to India for all these years but now she is dead set on going back at least for a year.

My question is how long can she stay outside the US without getting in issues when returning. Some places it seems a GC holder can only stay overseas for under 6 months max but some places I read that we can file reentry permit etc. She is 82 and has no desire to be US citizen, just wanted a GC to stay with me in her old age.

Has anyone faced this situation?
 
dos she still need re-entry permit if the india visit is from may to february ( i.e. less than a year but more than 6 months and while the green card and advanced parole are valid)
 
The AP is no longer valid once she got the GC.
A reentry permit is not needed for a trip of less than one year. However if the plan is for her to be gone for over six months and briefly return to the US before leaving again for several months back to back, her best bet is to get a re-entry permit like I earlier recommended.
 
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