- Failing health, already has nearly died. - No safety net. - Risks life every time this voyage is made. - Doesn't have access to many resources.
Here you have someone who doesn't have (what appears to be) working plumbing. Doesn't even have a _kitchen_ (just a hot pad). No assets or finances to speak of. Likely no support network. On top of all of that you want them to tackle a nearly impossible task of giving up addiction? I'll note that many many people with all the resources in the world cannot break addiction, let alone someone with nearly no resources.
Definitely not wise for her to continue with her habits as they are. But given the amount of stress and pressure, along with impending doom, some semblance of mercy should be exercised. It's not like she already doesn't have other major problems requiring her attention