You can only file a 485 application through your mom if you have an approved I 130 petition for alien relative through your mom.
So, if I understand you correctly, your mother filed an I-130 for you, and it has been approved? Are you married? Have you maintained lawful immigration status in the USA?
It appears that you might be able to adjust based on your mother's approved petition, if in fact it is approved. But we would need to know more information, especially about whether you have maintained lawful status in the USA.
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If you have an approved I130 and have maintained lawful status you may be able to.
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