I posted last week on another thread about a video I saw posted on FB from YouTube with almost this exact scenario but it was a young guy. He was in Walmart, walking around filming, claiming he had just been diagnosed and he was going to infect people because if he was going down, so was everyone else. He claimed once he left Walmart, he was going to several other stores to try and spread the virus.
I never heard another thing about that video and I was hoping he did it to get his 5 minutes of fame. This girl sounds like she copied that guy.
ETA: I looked this up on YouTube to find the video. I ended up finding a news story. The guy was from North Carolina and was arrested. It was a hoax and he was charged with a felony.