Is it bad if I want my sister to keep her money instead of getting me a gift?

My mom and sister put up money together to get me a new tv and I appreciate it more than they know but I asked them to cancel the order and told my mom to give back my sister the money she put up and to give her the rest of the money instead of getting me a gift. I’m not trying to be rude, I just don’t want my little sister spending big amounts like that on me. I would rather her go and spend it on herself. And then she started balling her eyes out becuase I wouldn’t accept her gift. I tried to comfort her and tell her that I know she did it because the loves me and wants to see me happy and told her that I appreciate the thought, and that the thought is all that counts. She’s 15 and Put up like $400 on the tv. She was working part time for the past 6 months just saving up for that and I just can’t accept that much from her. I feel horrible about not accepting it, but I would feel horrible accepting it too. It’s literally all her money. I did still give her presents and stuff but I just could take her gift because I want her to have more. Am I a bad person for this?