You (she) can draft the agreement such that she agrees to jurisdiction, venue and choice of laws in your home state. That allows you to sue her locally, if she does not pay as agreed. You will likely be able to get a judgment against her in your local jurisdiction. However, obtaining a judgment is only the first half of the question. The second half is being able to enforce the judgment. A judgment is only as valuable as the assets she has that you can use to satisfy your judgment. If...
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More details are required (a review by an attorney of all pertinent documents) to precisely answer your question. Generally speaking, your divorce decree only impacts your legal rights and obligations with respect to your former spouse. That is, if the divorce decree so states, you may hold her liable for amounts you pay on her behalf. A divorce decree, however, usually will have no impact on third parties such as a student loan creditor. You can attempt to have the "student loan people"...