i don't think cell mates tend to murder each other as it's not worth adding more time to a sentence. the girls would prefer to slowly mentally torture her I reckon, shouting at her, threatening her, poisining her food, beating her up. inmates have one thing on their side and that's time, I think they'll enjoy slowly ripping her apart mentally over time like she did to Arthur. she won't be protected forever. but of course we'll never actually know as we're not actually there