Why does she use the word “healthy” here?
In this context, "healthy" actually means "good." When the expression "healthy choice/decision" is used, it means a "choice/decision" that is good or beneficial to oneself (and not necessarily only to one's body). Ex: My parents allowed me to make mistakes and learn from them. That's how I learned to make healthy decisions in life. Ex: I think taking a break from school or work when you're feeling overwhelmed is a healthy choice.