I'm not sure where you would find written info but unless she's been taken there from prision she can leave at any time haha but I'd say I'd want to know why the catheter was put in in the first place? It sounds like your friend doesn't trust her care provider..this is what is wrong with the maternity system in my view, woman should have access to continuity of care with a care provider of their choice so they can trust and feel informed and be able to give consent for interventions and not later feel as though they have made wrong decisions or need to escape....not saying you friend is or isn't feeling this way, I totally realise she may just want to get back to the comfort of her own home..it just sounds like it might be otherwise due to the catheter situation