To those who don't believe she is using substance
I'm a recovering addict. I have used many substances including cocaine and benzos for extended periods of time. I have also been around people who have done the same and worse. For the children or uneducated adults saying she's not using, she likely is.
With cocaine you see the dull skin, as if someone has sucked the life out of you. Lack of consistent sleep and being up at all hours of the night. Dilated pupils. Weird posting of content/behaving in odd ways. Extreme weight loss (it is a stimulant after all).
It's not uncommon for cocaine users to also take benzos when comedown hits, because believe me comedown is insufferable.
Benzo abuse also often results in odd behavior, often zombie like. Appearing lifeless.
It's also known that Artemis is/was a user. It's incredibly common for friends, family or romantic partners to get involved with substance in this instance.
If you don't think the evidence is there then I don't know what to tell you.