I understand she's upset that all her friends died but drugs are not the answer, she is always talking to herself worried that she will get busted. That's why she sells all the good stuff after you level her reputation, it's just so that she knows she can trust you and sell you drugs without getting busted.
It's easy to judge an addict, blame it on lack of will power, say the guardian is just too lazy, compare them to others "why can't you be more like Ikora?" But until you've walked in their shoes you are just doing everyone a disservice. Drug addiction is an illness, these guardians need help, society shouldn't just write them off as a lost cause. Have you offered to find her a treatment center? Guardian interstellar has benefits which cover in-patient treatment, probably she feels hopeless and may just need to know someone cares & help is available.
You know the speaker had a problem with this once, he started to tell me about it but we ran out of time.