My deepest condolences to my BFF

Salam.

My Best friend aka my roomate aka my childhood friend since standard 5 is having a hard time right now. I dont know what to say. dont know how to react. She had just lost her sister because of an accident. The deceased left her family and 2 year old son. Yup!.. her only son..... so sad..
I couldn't imagine what I'll do if I was at her place. In the end I gave her some money before she went back home. Then I left my room to go for an event organized by my faculty..And when I got back to my room, she had gone and I found the check note on the floor and a there was a little tear on it.

Now, I felt that I did wrong. Was I wrong?? My feelings are all mixed together. I felt sad for she teared my money and threw it on the floor - oh, and it was near the dustbin - I guess, she tried to throw the money away.. But, isn't it common if we gave money to people who just lost someone??.. Again, did I do a wrong thing?... I tried to be understanding but still I felt very hurt... Should I talk to her about it?.. Or should I just keep it to myself?..I felt like to cry right now... Even if she doesn't want the money, why would she have to tear & throw it away like that............ oh, I really need someone to comfort me.. please.. can you?