"Unpaid support worker on call" - and kind of a monkeywrench in the works? You offer her an out so she doesnt attach to her own t, to her possible detriment and yours.

You know how they say, rights come with responsibilities? Like the right to drive, the responsibility to not drink. The rights and responsibilities on both sides of this relationship can neither be defined nor agreed upon. so what are you playing at? stop being a victim of circumstance.