Birth certificates are issued by the state where she was born. You can contact the state’s court clerk where you can acquire a certified copy of birth certificate, even though it is a replace birth certificate it would still be the original certified copy. In order to obtain an original copy, you must turn in an application that includes full name, parents full names, which they assume that you possess them, the location of birth and the purpose of your search and you’ll also need the date of birth.
For each state, there is a different fee structure to obtain a copy of birth certificate, usually the fee’s are between $10-15 but, make sure you check before you send application requesting a copy. Some states offer an “heirloom birth certificate” but, those certificates are mostly for “petty uses”, they are not legal documents that can be used to prove birth or legitimacy, so make sure that you are not trying to get an heirloom birth certificate, make sure that you are requesting a copy of certified birth certificate.
Hope this help.