I sent an email to a good friend from college and her husband, to give them a heads up regarding my wedding date --- they live abroad, so I wanted to give them as much notice as possible. (our save the dates don't go out for a little while). Based on earlier conversations, I was under the impression that this friend would either attend the wedding with her husband, or on her own. However, she replied saying that she would like to bring her sister as her date.
Since I haven't sent the official invite yet, I can't claim that her sister is not on the invitation. However, our reception venue is extremely expensive and I've had to work hard to cut down the list to include close friends and their spouses. No one else is bringing a family member/friend, if they are bringing dates it's a spouse or a long-term boyfriend.
I'm afraid that this friend won't come at all if she can't bring her sister. Help, please!