As soon as she gets Receipt Notice of I-485, her status is Pending Adjustment of Status, which is totally legal. File ASAP!!
You could have filed both I-130 and I-485 together.


Quote Quoting sfcitizen
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I am a US citizen (CA) and have just received notice of approval of the I-130 for my mother. But the notice says that she will receive further instructions in a few months. She is currently here on a B1 visa but she is supposed to leave next month. If she files for Adjustment of Status today, does she still have to leave, or can she overstay legally? And if she does need to leave, does she have to file any other forms in order to return? She is currently babysitting for my sister in NJ (who has a green card here) and it would be better if she could just stay. Any advice would be very much appreciated. Thank you!