You should be able to tell a GOOD friend nearly anything if said with the right heart and motivation. You should most definetly tell a good friend when they have wronged you however you are capable as soon as you are capable. If you need to, write it down! You should be able to tell a good friend your darkest fears, deepest secrets, and strangest desires. You should most definetly be able to tell a good friend that the dress she has on is SO not right for her, to save her the embarrasment of course. :D You should be able to tell a good friend that you want to steal her awesome shoes and then ask if you can borrow them, if you already know you're the same size.