Also when I go to refer friends internally, I might reach out to the internal recruiter I already have a good relationship with.
Her bonus may also depend on your tenure. In most companies, when referring someone, you lose your referral bonus if your referral leaves in less than a year. She's not going to change your tenure by checking in with you though. Your performance is unlikely to be in anyway related.
Companies do collect feedback from employees on their recruitment experience. There's always a chance you'd go out of your way to give positive or negative feedback on your experience.
But also it's just... That's the job. If there was no specific bonus tied to documenting code, or testing, or following coding standards, or being pleasant to coworkers, would you completely skip those aspects of your job? Recruitment is kind of a sales job - a good sales person should follow up on their wins after closing a deal.