Usually only parents can have custody of a child under 18 unless the child is given up for adoption. not sure what you're asking here.
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Typically this relative (your aunt, your child's great aunt) can't just 'take' your child no matter what state you are in. If you want your child back and she will not give you the child, you have a host of remedies, such as filing a kidnapping charge.
Depending on exactly what you want, you may wish to seek legal counsel. Because there is a child I would not hesitate in seeking legal counsel.
I am licensed in New Mexico and Pennsylvania, and therefore any discussion of issues related to other states must considered within that context.
In addition, my comments are not intended to create a legal representation but merely to respond to the limited facts presented by the question. Any opinion herein is not meant as a precise statement of legal rights or as a recommendation of any particular course of action.
A more complete legal review can be obtained through local counsel.
If your great aunt took your child without a custody order, call the police immediately. If for some reason she was able to obtain a custody order, see a family law attorney to determine the best way to regain custody of your child.