Why did the FBI do a background check on mrs. penny?

The FBI conducts background checks for various reasons, typically related to national security, law enforcement, or when an individual is applying for a position that requires a security clearance. If Mrs. Penny was involved in a situation that warranted scrutiny—such as applying for a government job, being a witness in a high-profile case, or having connections to an investigation—this could explain the background check. Specific details would depend on the context of her situation.