Single best friend (also a bridesmaid) angry about plus one situation??

If they don't respond in time. No plus 1, sorry. Why would your bestie want to be stuck with some random person all night?
I didn't give plus 1s to my single guests unless they're a Vip guest that didn't know anyone and or if they were traveling for my wedding and coming alone. Thought it would be nice. I also gave the grandmas plus 1s so they can bring their caregivers/aids/bestie

FWIW, I think you handled the situation gracefully. Your request was reasonable. She's got feelings about this, but it may not be directly about the situation you're describing. I would ask her gently if there's a concern she has instead of assuming it's about the +1 situation, just to be sure. If it is indeed about the +1, I don't think you need to change anything. It's a reasonable request to know who is attending your wedding by the RSVP date. Good luck!

I would just like to say that you handled your part of the situation wonderfully. Yes, wedding party members should always be given a plus one if single. However, you immediately corrected it when she brought it up. So I couldn’t imagine she is upset about that. Maybe she read the message and just plans to comply with the request, and didn’t feel a reply was needed? Or maybe she’s just been busy. How long has it been radio silence with her? Have you text her other things, non-wedding related, and she has ignored them?

Keeping in mind that couples generally automatically invite partners but not random dates for unattached singles, you handled it as best as you could. How many of that guest list are partners that the invited couples have determined on their own that they are exclusive? Because if they decide they are a couple at 3 months or they have lived together for 10 years with no plans to marry, that is valid and both need to be invited by name. How many are actual unattached singles? There is a misconception that guests can not ever enjoy themselves if they are invited without a date, because random plus ones (which are not the same as a significant other) are always optional. It is not a breach of etiquette. Many people attend weddings solo every weekend without any drama because they know at least one other person in attendance and they are able to enjoy themselves. That includes bridesmaids/groomsmen who may not feel comfortable asking a stranger that the couple doesn’t know to tag along, and it’s not a faux pas. If they can’t enjoy themselves, that is a them problem, not something for you to remedy.