Steve, I'm sorry that your question wasn't answered in a timely manner. Perhaps part of your post didn't make it into the conversation. It would seem that asking the woman across from you to stop throwing the food on the grass or keeping Tiggy inside would be reasonable. If Tiggy's inappetence, however, isn't related to that thrown food, Tiggy's vet will want to thoroughly examine her including diagnostics in the form of blood and urine tests. Inappetence in a 14 year old is always worrisome for major organ insufficiencies such as both liver and kidney failure as well as age-related cancers. Time is of the essence at Tiggy's age. She doesn't have the reserve of a much younger cat.
Please respond with further questions or concerns if you wish.