I'm not sure how the boyfriend figures in, but take it from me, people who may appear "physically just fine" to a casual observer may in fact be dealing with significant challenges.
Leave it to the AikiWeb community to extremely over-complicate a simple point!
Yes, she could also have been an alien from Mars, secretly out to infiltrate humanity, and Aikido was just her backstory. You never know! I also find that highly unlikely though.