How old are you? How come you didn't receive a green card with her.

Anyways to answer your question:
She can petition you as soon as she gets the conditions removed, however unless you're covered under 245i you will not be able to benefit from the petition. If you'll still be under 21 when she naturalizes and she files while you're under 21 you'll be able to adjust status as long as you arrived in US on a valid visa.

If you arrived on a valid visa you can adjust status via marriage to a US citizen.

*- 245i is an old provision of Immigration and Nationality Act, under which you can adjust status even after being US illegally or/and arriving illegally. Problem being you must've been a beneficiary of a green card petition or PERM labor certification filed on or before April 30th 2001, and the primary beneficiary of the petition must've been physically in US on Dec 21st 2000.