I wouldn't have bought the sposies, you're very patient with your mum! None of Molly's grandparents use cloth nappies on her, no matter how easy I make it for them! But they all buy the sposies they use so I dont mind.
But I think its a bit rude of her to ask you to buy bed-mats as well
Especially when you have cloth nappies that wouldnt require them, and its not like one night nappy is too much of a challenge for anyone!