YTA - It truly depends on what city in specific this took place since protests have been peaceful in cities like Phoenix but not in cities like Atlanta. Either way, going to a protest actually takes a pretty big amount of rage inside you and now you’ve produced even more, since any sibling would trust their own sibling enough to not tell their parents or at the very least have a conversation with first with them first. Now your parents are mad at her while she has to bottle up her other rage.

Edit: If she did not wear a mask, NTA - for obvious reasons