Over the limit guests ...?

Well we did discuss the limit and she understands the extra cost. There wasn't a "I'll cover if there are any extras" so that's my confusion.

As for this certain situation with my friend. As of now, no she is not dating anyone. If that happens to change before invites, we can add him to the invitation.

We weren't adding plus ones for single people due to the small number we have for our package. Family and friends we want there will be invited and we just figured our single friends could come solo if they'd like. Most everyone would know people. Just depends on who plans to go.

If your friends are truly single (as in not dating anyone), then that's fine. If they are dating, it's not fine. And just don't let your friends pay to bring a friend. That cheapens your wedding.

Let me get this straight. You have a 40 guest package that you paid for, but the venue can accommodate more if you choose.

Your FMIL asked about invited others and you said that was fine, but now want her to pay for that. That should have been discussed the moment that she asked. "May I invite extra guests?" "FMIL, we have budget for 40. We cannot go over that amount." FMIL "If I pay for 10 extra people would that work?" You: "Yes". If that discussion did not happen, but you told her she could invited extra guests, you are not the hook for the costs.

Also, telling your friend, with a plus one that she can bring a guest for a cost.....tacky!

FMIL PAYS

We did have the discussion of our limit. Since our DW is in Mexico, she wanted to invite relatives that live there.

So fmil said if her extras go over the limit she will cover that. If we have any extras that go over we will cover them.

We also will not have anyone pay to attend the ceremony and reception. If any single folks relationship status changes by invitations, we will accommodate their attendance.

You have slightly changed your story. In your original post, you ask if you can ask her to cover the costs of those she invites (over the 40 person package). Then in your last post, you state that she agreed to pay for the extra guests that she invites.

So, which is it?

@kathy r- Yes. I originally wasn’t sure if we should ask her. My fiancé told me that she offered to do that. It’s not changing my story. It’s the update of what happened.

You can't ask your guests to pay.

There is absolutely no scenario in which your guests should have to pay based on the conditions you describe.