The pricing policy is very strange, it's £250 for the first hour, then £25 for the next half hour, or £50 for the next hour?!?! It would surely make more sense to book her for 2 hours, can't get my head around that

But if you've managed to get her rate down a bit, then she might change her pricing policy across the board, especially due to a dusty phone.
Good luck mate, genuinely!