She does, though, because it seems like she's deep into the weedbro lifestyle and wouldn't be comfortable anywhere where she was disconnected with that lifestyle. She'd have to say goodbye to her few remaining friends and learn how to make new friends in order to let it go now. In a tiny place like Rutland, even if you try to dump all your friends, you're still going to see them from time to time, just in the course of daily life, and most of them will still sell you weed.
Especially with her job at the convenience store, she probably interacts with a dozen people a day who she's smoked weed with before, who would sell her weed or just smoke her up out of misguided weedbro friendship.
It's not going to be as easy for her as "Have you ever considered not smoking so much pot?" I mean, she COULD do it, it's not impossible, but she'd have to really want it, and it's clear she doesn't. If she'd like to stay in a failure to thrive holding pattern, she's entitled to do so, and lots of people do. It's not like we're talking about the next Microsoft CEO here or something. It's Nikki. Being gainfully employed and adequately housed and partnered is at the top of her skillset. We really shouldn't expect more than that from her imho. Just understand, if you send her money, some of it's going to support her weedbro lifestyle.
Edit:
That's a really good idea. First rational thought you've had in a while. Nothing good would have come to you from pursuing it.