Yellow Striped School Dress (Newquay TR8)

Hello, has anyone got any good condition Nansledan School Yellow Striped Banner Dresses they no longer need please? Sizes: 6-7, 8-9 or 9-10 years. We're not completely sure which size will fit our daughter best as she is very tall for her age and clothes sizes vary on her. Can collect from the Newquay area. Thank you so much for your help.