Interesting idea, but I doubt it. Thing is, she managed to find herself a doctor who will prescribe pretty much anything with few questions, so even if she is an addict, I don't think she'd be spending much money on it. She'd get a prescription or I suppose just steal it, like you suggest.
She drinks a little too much though, especially for someone who's on anxiety meds most of the time. She doesn't ask people for money except when it's owed.
Anyway I'm pretty sure I do know where all the money goes. She's always buying stuff, going out to eat, going on weekend vacations, buying subscriptions to magazines and cable and services like Audible. Plus she's always been one of those holistic people, she doesn't like (supposedly) taking clonazepam and has been looking for natural alternatives. Her degree is actually in chiropractic, she's against a lot of medications.

Costco is actually where my mom got the last big box of omeprazole she gave us. Took almost a year since we don't take them every day (supplement with Tums so we don't get bone loss) but it's gone now. She actually took me to Costco a couple weeks ago, I saw them there but was on a budget and looking for only food. Maybe I'll see if we can stop there next time she takes us grocery shopping.

That's the thing with my mom... She does help out, and even if she wasn't my mom I don't think I could hate her. I know she cares. I feel like she's a better mom than my roommate's mom, I know mine would visit me in the mental hospital, even if I got there by overdosing on psychedelic drugs or something. It's just that she seems to have ulterior motives and hidden expectations. It's not just expecting to be paid back, it's expecting us to take our lives in a certain direction, and feeling like her help is wasted if we don't. I get it though. Much as I hate to admit it, we're a lot alike.

Which is why I just can't understand this latest thing. I would never do this, unless I had a contingency plan, like use some of the cash for groceries now, but keep track of how much I was given, and make it up out of my next paycheck. I dunno, maybe that's what she meant to do, and just forgot.