I’m not her mom

So I just called the National Association of Sports Medicine to sign my girlfriend up for a course to become a Certified Personal Trainer, because I am paying for it. The woman asked if we’re related – I said yes. Though I cannot imagine why it would matter. I mean isn’t it my choice if I want to find a perfect stranger and pay for something for them??? Anyway, I digress. An email was sent to my girlfriend for her to ‘sign’ confirming that she’s going to complete the course work. In the email, the NASM person referred to me as her MOM. Really? My girlfriend texted me a screen shot of the email and said, “She assumed mom, but not wife.” Lol