Hepatitis C :: Cured Of HCV But Now Positive Again

My new girlfriend, who I like very much, was very open with me about the fact that she had a blood transfusion as a baby for several surgeries she had to have, which left her HCV positive.  She and I were about to move into the sexual part of our relationship, so we both got tested for STDs to show each other we had a clean bill of health.  Well as it turns out, her bloodwork showed she was HCV positive again...this is after achieving SVR (not sure for how long she had achieved this yet).  She told me and was very upset, so I obviously just gave her a hug and held her.  No other way to respond she was so upset.  I'm curious, does anyone on here have any experience with this?  Possibility for false positives or possibility for her to need to seek additional treatment?  I hope you can forgive any questions that may seem ignorant.  I am mostly focused on her health, but naturally I'm also concerned about the implications for our future relationship (I understand it is very low risk to pass it to me through sex, but still, I'm human, and I'm just carefully looking at this situation).  If anyone can shed some light on her situation, I'd love to hear it.  She's a great woman and I'd like to get any info for her that could help.