Family Member or Loved One
I am so sorry to hear about your sister. The National Breast Cancer Foundation partners with hospitals across the United States to provide funding to the hospitals for screening and diagnostic mammograms, clinical breast exams, and breast ultrasounds for uninsured, underinsured, and underserved women. I'm sorry, but PET scans are not included in this.
However, you may want to go to this link (http://www.imagesofhealth.com/pages/facility-locator.php) to find a facility near your sister that may be able to provide assistance.
I wish you and your sister all the best.