Bringing a Plus One we know but didn't invite?
So my FI and I met at work and have a number of mutual friends. However, we decided only to invite those we felt closest too rather than feeling like we had to finance a work reunion (we've all transferred since meeting). So, we sent out of invites and gave every single person a plus one. I know that I cannot in any way dictate who brings who, however, I had a question from one of my guests that puts me in a super awkward position.
He asked me if he could bring one of our friends from work that we did not send an invite to as his plus one. She had mentioned really wanting to go and I suppose was expecting to receive her invite in the mail. I don't dislike her, but to control my guest list she didn't make the cut (I do not have a B-List). We have the room (especially since we budgeted for the plus ones) but I can only imagine how she would feel knowing she didn't get invited but was being asked to go as a plus one. I would feel so awkward in her shoes.
In hindsight, I probably should have made the room and invited her, but it's too late for that now. I do not want to tell my friend not to bring her...even though he's given me the out by asking me first. I want to do the right thing for everyone but have no idea what to do. Help!