Can I tell a friend that I didn't like the birthday gift she gave me?
She's your friend! Why would you tell her you didn't like the gift?
I was expecting it to be something else. I was so disappointed.
It is rude to not be grateful for gifts. They didn't have to give you anything at all. You should be happy they thought of you.
She should see it from my point of view and understand why I'm unhappy.
I think instead, you should try to see things from her point of view. She took the time to find a gift for you and spent money on it. You should just be grateful that she put in the effort to get you a birthday gift at all.