No, no caps. But the amount considering how much you loaned her could be considered "unconscionable" by the courts as to the amount of interest.
Unconscionability is a term used in contract law to describe a defense against the enforcement of a contract based on the presence of terms that are excessively unfair to one party. Typically, such a contract is held to be unenforceable because the consideration offered is lacking or is so obviously inadequate that to enforce the contract would be unfair to the party seeking to escape the contract.
In and of itself, inadequate consideration is likely not enough to make a contract unenforceable. However, a court of law will consider evidence that one party to the contract took advantage of its superior bargaining power to insert provisions that make the agreement overwhelmingly favor the interests of that party.
Usually for a court to find a contract unconscionable the party claiming unconscionability will have to prove both that there was a problem with the substance of the contract and the process through which that contract was formed.
The substantive problem will usually be the consideration, but could also be the terms, interest payments, or other obligations the court finds unfair. Procedural issues that a court could consider include a party's lack of choice, superior bargaining position or knowledge, and other circumstances surrounding the bargaining process.
Upon finding unconscionability a court has a great deal of flexibility on how it remedies the situation. It may refuse to enforce the contract, refuse to enforce the offending clause, or take other measures it deems necessary to have a fair outcome. [Wikipedia]
It's a risk given that you loaned her monies but only over the past year you stated.
The quickest way is to pay a people search firm to find her - they don't charge that much but charge accordingly as to how much time they put into finding her.
You can find such companies through google or your local Yellow Pages.
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