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If it was 15 years ago, then she has no claim. The statute of limitations would bar any suit for return of the money or any criminal charge for signing the check in her name. The money was to repay for damage on business property and was then used for business purposes. It was also in the normal course of the business so I don't see where there would be any liability even if the SOL didn't come into play. That doesn't mean that she can't try to use it against you in the divorce proceedings but no judge is going to give it any significance.
You reallly need your own attorney.