We aren’t really provided with much of a scenario. We are told that such scenarios happen often. And that’s important point.

She can make her own changes. Plenty of options. Make new friends, explore the nature of her feelings about other people liked more, examine why such scenarios happen often?, see if Sarah might not be that bad of a jerk etc Although she isn’t able to change how that lady feels about Sarah, she can make other changes in regards to her own choices and relationships with people.