The 'read message' is sometimes misleading. When messages pop up on my screen when I'm in the middle of things a lot of the time I swipe them but don't actually read them. Call her, this is the best way to communicate with someone directly.
In that case, I would DEFINITELY give her more time to respond! From your original post, I assumed you were talking, say, a week. I'd probably let it be for the rest of the day and follow up with her tomorrow or over the weekend
Give her a call to follow up. A 'read' message can mean anything really from a technical glitch with how the phone is designed when the messages pop up or she could have seen it and got busy/sidetracked before she could reply.
You said you messaged her, does that mean you asked through a text or email? I think you definitely need to call her or try to see her in person to talk. I think something as special as asking someone to be in your wedding deserves a little more than a message.
This is your potential bridesmaid, yet for something so meaningful, asking via text isn’t a very personal approach. So I’m not sure how I’d feel or if I’d respond either if I received such a text. I mean. what if your fiancé proposed via text (just a thought)? Now don’t get me wrong, I’m not a fan of the bridesmaid proposal boxes and that hoopla. But I do believe that if you’re asking someone to stand by you during your wedding, that it deserves to be done verbally, either in person or via phone or zoom/Facetime. But, unfortunately, a text feels very halfhearted and lackadaisical.
I actually went to see her and she thought she had responded but the message didn’t go through. She said yes! I can officially start working on things for my girls now. I also asked if any of them took offense to me asking via text and they all said no .. they understand that I’m a full time mom, I work full time, and I’m a full time student .. and now I’m planning a wedding on top of all that. I think everyone has to do what works for them at the end of the day. Thank you all for your replies! ♥️
I agree with everyone else on this, I'd send a follow up message and make sure she got it. And if she did get it and doesn't respond in a week I'd move on to someone else. If she seen it and doesn't want to be in your wedding she might not know how to tell you.