Answer:
Of course she has, Roslyn stole Organic Cornucopia's trade secrets. She is specifically contacting their vendors and customers.
Even though you cannot register a list of vendors or customers, they are considered trade secrets that must not be given away or used against the company by their employees or former employees in this case. Even if Roslyn's contract with Organic Cornucopia didn't include a trade secrets clause, it is reasonable that employees cannot act against the company using them and she was very direct, there are no excuses here.