Final answer:
Lisa is engaging in Volunteering by offering to help at an animal shelter without being paid. This act of donating her time and energy for the benefit of others differs from job shadowing, training, or working, as it does not involve observation in a professional context, formal learning for specific job tasks, or receiving payment.
Step-by-step explanation:
Lisa is considering becoming a vet and has offered to help at the animal shelter without being paid. By offering her time and assistance without expecting financial compensation, Lisa is engaging in Volunteering. Volunteering involves donating time and energy for the benefit of other people, places, or causes, typically without receiving payment in return.
Job Shadowing is a related but distinct concept where an individual observes a professional at work to gain a better understanding of what a job entails, but it usually does not involve performing work tasks. Training often refers to learning how to perform specific job duties and occurs when a person is already employed or preparing for a job. The term working typically involves performing tasks in return for payment.
In Lisa's case, she is not only gaining experience that could be relevant to her potential future career but is also providing a service to her community, aligning with the nature of volunteerism.