Modern etiquette on an awkward guest

I personally am of the opinion that plus ones are for significant others only. Not a friend, not your neighbor's dog's hairdresser twice removed. However there's no harm talking to her about it. How far does have to travel for the wedding? It's possible this "friend" may not be able make the trip. Overall though, my concern is that she would be uncomfortable with this friend's overly affectionate behavior toward her and could maybe use a break for the event.

View Quoted Comment I would just keep it light hearted. It doesn’t need to be some serious sit down discussion. I would use the excuse of “we are getting all our information together to send out invitations”. Just let her know that you and FH are super excited to have her celebrate with you, and you both want to make sure she has a great time. Quickly run through the itinerary (so she will know what activities a potential guest would be attending and who all will be there), then ask if she would feel comfortable attending alone or if she would prefer to invite a guest to attend with her. If she says she wants to invite a guest, just say great! And ask if she knows who she would like to invite.
I think we brides tend to needless worry and over-analyze/overthink every little detail of our weddings LOL You are going to be so busy having fun during the three days of your wedding, you aren’t going to be worrying about/noticing FSIL‘s guest. But, if FSIL is lonely/uncomfortable/bored, that is what she will forever associate with your wedding. Even if she chooses not to have a guest, I guarantee she will very much appreciate you extending the offer.

I agree with the person above. I as well had to have my fiancé talk with his sisters as I invited them to be bridesmaids. It’s not your job to discuss that with your sister in law it sounds better coming from the fiancé! He’s gotta have your back no matter what. I would have him be straight up with her so then nothing is miscommunicated and you don’t have to have that awkward conversation.

I would extend the plus one if the budget allows it. You want to start off on a good foot with the in-laws. I'm all about avoiding confrontation, especially at weddings. But a lot of feelings can get hurt at weddings and some people hold a grudge and it makes going forward with the relationship difficult.

I do think, if you have or your FH has a good relationship with his sister, they can just ask her if she would like one.

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This was my initial thought also, it definitely seems like there is more to the story than the sister is ready to admit. I'd let her bring her.