snow tyres for my sister

My sister and I are pretty friendly towards each other. We have never been great companions but we have never quarreled much as well. To make it more precise, I could say that we were simply living our own lives. My sister has always been more lighthearted and outgoing while I have always been a pretty level-headed person. My sister, Jane, is all about thrills and excitement and entertainment. While I obviously like those things I tend to economize on them. I apply them in small dozes because I cannot handle more. I mean, going to a party once a week is fine for me. Whereas my sister has to party all the time. I never really cared much about it because it was and still is her own choice, but I think I would be quite upset if she ended up in a bad spot. I mean, I am her brother, after all. Therefore, I decided to make her a surprise. I know that she for sure will not buy snow tyres for winter. She is too reckless and, in a way, inane. I do not want to see her injured and in pain and thus, I will buy those cheap tyres for her. I would like her to grow up, so to speak. On the other hand, I know that she will not do that and in a way I feel responsible for her and that is why I want to help her by buying those snow tyres.