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If there is no personal guarantee signed by either of you, the creditor cannot seek to collect from you personally. In order to collect from you personally, the creditor would have to prove to a judge that you signed a personal guarantee. If it cannot produce documentation or other evidence to prove that she signed a guarantee, the court will not grant it a judgment against you personally. However, a judgment against the business would be obtainable.
If the creditor cannot prove that she signed a personal guarantee, then you are correct in denying liability (if you agree to pay, they've got you). You should demand that they prove personal liability, and if they cannot or will not, you should have nothing to worry about.