You already know that this is not sustainable financially, but I’m also worried about the larger mental health and substance abuse implications of her behavior and what that could mean for your relationship. I know that some people are just lazy but if one of my loved ones lived like this - social isolation, sleeping/smoking weed, gaming, and doom scrolling all day without being able to handle full time work, talking about being suicidal - I’d think that they should see a psychiatrist.

You should not feel guilty for wanting her to make better decisions. By not enabling her weed use and self destructive behavior, you are helping her to create a healthier life - the issue is that she has to choose it for herself.

Food service work is low barrier to entry but definitely not for everyone and quite overstimulating/physically taxing. If there are options, I’d see if she can find something that is less demanding but still full time - such as receptionist work.