Sadly drug abuse and addiction crosses all social boundaries.
It’s interesting that she says she does not have Hep C. Hard to transmit something you don’t have, regardless of whether you’re stealing drugs… It’s also very easy to prove with a Ab and PCR if she ever had the disease or did have the disease.
The claim not to have Hep C might be based on having a negative PCR (due to natural clearance or getting treated). A lawyer would allow stating “I don’t have hep C” in this context as it it true. It might leave out “but I did, and got rid of it”… but that’s lawyers for you.