Maybe im being naive, but if the church needs magic and she is a big bottle of it and they all live in the same city, i dont see where this has to be a problem "Yeah im dying and have to buy super expensive stuff to not die; you guys need magic and are desperate and willing to buy it; solution: Myne goes there to touch the grail to give them magic, all while she reads the books, she then goes back to her normal work. The church gets all the magic they want and myne doesnt have to spend a penny to stay alive AND gets to read the books. i cant see where this is a bad deal for any of them. After a month or so when shes tired of reading them they could even start to pay her. If it doesnt turn out this way i will be a more then a bit disappointed, but i suspect the talks will result in this but start out far worse.