So today I dropped off my BMs dress to her (she happens to be FIs sister). Knowing the dress would be a little long on her I made a comment that if she didn't want to spend money having the dress hemmed (we are having a barefoot beach ceremony) that I didn't mind if she wanted to just hold her dress up while she walked in the ceremony and then could wear whatever height heels she wanted for the reception. Of course I would also be fine with her having the dress hemmed, but I know that can be expensive and didn't want her to feel pressured. After all, the ceremony is only 20 minutes, and if she didn't mind holding the dress up to save money I was going to be totally fine with it. After I made the comment she said that sounded like a good idea and she probably wouldn't get the dress hemmed, and that she was probably going to change into a different dress for the reception anyway. After she said this I was a little taken back and changed the subject really quickly. Part of me feels like it's no skin off my back if she changes out of the dress after pictures, but the other part of me feels like its kind of a strange thing to do when the entire event is only 3.5 hours long max (no gap).
The other weird thing is that I only have one other bridesmaid, my MOH, and I don't know if she would then feel weird still wearing her dress.
Is it okay to kindly ask her to please wear the dress for the reception? Or do I need to just let it go?
FWIW, we went dress shopping together and she said she liked the dress. I also didn't do the popular bridesmaid proposal, because I didn't want anyone to feel forced/obligated to be a bridesmaid.