asking my sister to delete pictures of me that she posted on facebook

for context, my niece is doing a fundraiser for school and she gets $1 for every minute she reads. i read with her yesterday, and my sister took pics/videos of us reading. without asking, she posted the pictures on facebook. i would just like to mention that i’ve already donated money, and she has already raised HUNDREDS of dollars, and people continue to donate. also, my sister kept the post up but deleted the pics with me in them (kept pics of my niece reading with my grandmother), so she still has a post for an update.