Is that notary new to the business and didn't understand to invoice you only? If escrow used your service to find a notary then received notary's invoice with completed package, why did escrow pay notary directly and why didn't they question the validity of that invoice? Have you asked notary to reimburse you the fee and what was her response?
To answer your question ... yes, there methods/sites to negatively impact a notary. How did you find her? What is her marketing strategy?
You and your service have been around many years. Surely this is not the first poor experience?