Wow, I cannot believe the idiotic responses I have seen on this thread. "Break her face", "break something she likes", "cut off the hair of her dolls". Wow, I cannot believe how unsophisticated and immature people here are.

The obvious answer is to try and work it out with your parents, try and tell them what happened, it's YOUR DS and she shouldn't have scratched it and ask them to find a way for her to pay you back for it. Simple, and what's even better is that YOU won't get in trouble for breaking something she has just for the sake of idiotic "revenge".

Platyphyllum

Wow, though I totally agree with you, instead of making everyone else seem bad, you managed to make a donkey of yourself. Congrats. As for the topic, well, things like this happen. Its a part of life, as well as having a younger sibling. I guess now you should: either ask your parents and explain to them what happened, save up for one yourself, or take up a new hobby.