I'm angry at my sick roommate for not making an effort to stop germ spreading
Have you asked her about this?
My roommate can be very selfish at times, she didn't even make an effort of cleaning up the mess.
I get why you are frustrated. I would not want my roommates germs either. They should be in their room as much as possible if they are really that sick.
I spent a lot of my time cleaning the germs and now I'm sick. It's unfair.
Depending on what they have they might not be able to care for themselves. Have you contacted their parents to see if they might be able to stay with them or help out?