Something happened to me like that too. So my friend requested a drawing she wanted. I was like sure cause we’re friends and I’d do anything for my friends. Then I gave her the finished drawing. A day later, she took out her sketch book. There it was, my drawing, all colored unlike before. I was surprised and curious, so I asked her if I could see it. She said no BECAUSE APPARENTLY SHE DREW EVERYTHING- I never wanted to make another drawing for her ever again :’/