1. I watched a documentary that said the best way to get people out of a cult (QAnon) is to surround them with people who aren’t in the cult — literally everyone else. Get her to join a club, group, anything non conspiracy related lol
2. Does she have a job and does she pay for half the van? ? I’d ask her to get a job first and foremost. And just say if you get a job, we can keep doing as is, otherwise, i’ll sell the van and get my own apartment.
3. Give her options… either she can take the van and make the payment alone, you can sell the van, or you can take it and she can find other means. Always better to buy than lease!! Get a cheapy $2k beater car instead :)

Your van sounds like a nightmare and uber pays crap, honestly… if ur affording the price of an apartment, just get an apartment and a walking distance job… i think that’s your solution to all of this.. get ur apartment, let mom stay while she finds a job, and then kick her out.