I'm still looking into this and forming my opinion. It's very curious how at the end of her YouTube video she mentions other residents in her building came forward and said they too were sick (numerous ER visits over 2 years), and they DIDN'T KNOW WHY, until they saw her expose in the newspaper. That seems to counter your hypochondria theory, no?
see: https://youtu.be/pGK4_sR1CvY?si=KEK9xh0mUEStV76-&t=2680