Read the 1099-misc requirements ... nowhere does the purchase of personal items or inventory require a 1099. Her proof of payment is in the receipt you gave them ... and in your case you also had a contract. I would point out these rules to her in response to her request. I would also be cautious as this may be the start of a legal proceeding.
https://www.irs.gov/businesses/small-businesses-self-employed/am-i-required-to-file-a-form-1099-or-o...
