Well, if she already knows the kind i like maybe Id be a little irritated. If she didnt know the kind I like Id prefer she call and ask. Since she did offer, she should get the kind I like. I just think this is petty - if she didnt offer there would be an issue too huh? Cant win.
I personally don't mind if she offers or not. But if offered the extra steps should be taken to assure she gets it right.