My Girlfriend Has Cystic Fibrosis and Has Caught Pneumonia. Will She Be Ok?

My girlfriend has cystic fibrosis and 3 weeks ago suffered a collapsed lung. She was treated with 1 tube then 2 tubes in the chest as the 1 wasnt working. After another week she had an x-ray and the doctor said he feared her lung would collapse again if they removed the tubes so they decided to operate.
The next day she went down to theatre and had the operation and then was put on a ventilator for the next 48 hours. In that time she caught pneumonia. After 5 days of antibiotics i was told she was making improvements and getting stronger but then 2 days later was informed that the antibiotics had stopped working and to expect the worst.However now she has been put on a higher and stronger dosage of antibiotics and have been told it is clearing the infection. However im still extremely worried as i was told before she was improving.

Could you please tell me what her chances of survival are as i cant help but worry?