Im trying to teach my Grandmas dog Lucy down but I dont know how does any one know a way that works well?

Iv been to my caravan now for 2 weeks! The first week was spent with my mum and dads friends sandy and kev and there children shannon my best friend,lighten her 6 year old bro and her 3 year old sis kadie may. We went to pilly palace and had a brill day. the next week I made a new friend called hannah we are now pen pals. This morning we are going home.