----Child is not married in this case but planning to get married in few months.
During her pending application she should stay unmarried until she got her green card.
--- Mother got green card recently and has taken it by visiting USA but going to india after filling re-entry permit. Can she file the petition for daughter's green card while staying in india for the extension period ?[/QUOTE]
The sponsor/parent should file to the USCIS. Is my understanding that you file inside the US, plus it suppose that the petitioner/sponsor should mantain residence in the US. But another person who has been in that same situation can answer you that question.
good luck,