Sorry for the delay. The holiday was busy with family, and I only just now returned. I am really confused now. You said they took away her green card. That generally means she was ordered removed/deported from the US. Yet you are saying she wasn't ordered removed.
I can only work off of the information you've given to me, so I will answer your question, assuming that she was never ordered removed.
If she was not deported or ordered to leave the US, then all that happened is that her green card expired. That does not mean her status has expired, only that valid evidence of her status has expired. Therefore, all she would have to do is to apply for a replacement card: form I-90.
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