Your question is best posed to a criminal defense attorney in the jurisdiction where your mother was jailed, rather than posed to immigration attorneys. On a separate note, if your mother's fraudulent use of another person's identity was used to get or seek to get an immigration benefit, then be aware that she may be subject to removal proceedings and even a very harsh permanent bar to re-entering the US.
It would depend on how may criminal counts she is charged with and whether they are felonies or misdemeanors. Each misdemeanor could carry a potential sentence of up to one year and each felony a potential sentence of up to 3 years. I strongly suggest that your mother retain the best criminal defense attorney she can afford.
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