If your mother entered the US unlawfully and is not protected by a prior filing that may give her 245i protection, under the current immigration laws, she is not eligible to legalize her status within the US.
If you are a USC you may be able to apply for your Mother and can then use the Provisional Waiver Rules (New) to get a green card for her. There are many nuances to this process. We suggest that you consider conferring with a qualified immigration lawyer.
When you are 21 you can petition for her but she may or may not need to return to her home country for final processing and then would need a waiver. Her immigration history will need to be analyzed to advise you for sure. Perhaps she is eligible to pay a penalty and file in the U.S.
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