Preemie Infection

Hey i just wanted to know how many of you have had run into a infection as one of those setbacks your baby can face ? My daughter was born early by emergency cesarean section because i had an infection. She was immediately treated with antibiotics and it went away . Now 2 days ago she wasn’t digesting her food properly (my/donor milk) and vomited so much to the point where she now has tubes down her throat to help clear her little tummy and to help her get her breathing back on track. Doctor said she has an infection again but don’t know where it came from .