Yes, she asked you to go with her to the store. Though, I saw no where that you said, your friend is not happy with her colour results. "Help" to pick fabrics may have a different meaning to her, than it does to you. If this is the case, there's no reason why you should be imposing your own desire for colour coordination on her efforts.
If she is wanting to learn more about colours, then a huge dose of patience may be required!!! :)