Hope dies last

You say, everything you do is wrong. Why do you think so? Your friend tried to help you and now you want to do the same. There is nothing wrong in it. Even if it doesn't work, your friend will be gratefull. She knows that you care and this is the most important thing. And even if it didn't work this time - don't give up! keep trying! As long as you do your best, you can't do anything wrong =)