Greetings Liljay77. There are good manuals out there (HRC's Getting Off Right is a good basic one) about harm reduction and safer injection practices.
Has someone been helping her to inject, or did she just run out of usable veins she could easily register in?
I'm going to move this to our Other Drugs forum, as that's the most fitting context to have this discussion. Welcome to BL!
NMI -> OD