12-year-old girls can be really hard to buy gifts for, they are still tweens and still kids at heart, but they are also fast approaching the teen years, and their interests are more grown-up than ever. So if you are stuck for gift ideas for your daughter or granddaughter's 12th birthday or Christmas, use this list of the best gift ideas for 12-year-olds; it's a curation of gifts put together by the mum of a 12-year-old girl whose own daughter loves all the gift suggestions, your 12-year-old…