She would be losing a $500 credit for claiming you. Also, whoever claims you gets to claim any education credits. Here is the IRS Worksheet for Determining Support.
You two may want to take a short online, anonymous, IRS quiz, to figure all this out. The Filing Status, Dependents and Exemptions will help figure out who claims who.
Also see Credits - who can claim what credits
The IRS is the best source for a correct answer to all of your questions.
If your mom owes or has a refund is due to what she had withheld at work based on claiming you and possibly education credits. She will definitely need to change her W4 at work as you are certainly grown up. It is smart to use Tax Withholding Estimator .
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