I hope she is doing ok. I don't know much about living with PML, but a woman that is on utube contracted PML. She used to make lots of videos about MS, but not so much after PML. I think her name is Angela. Just search PML on utube and you will find her. She's the reason I stopped Tysabri.
God luck to your sister!
age: 44, rrms 14 years, breast cancer 2011