Winter wedding

You could try saying "mom, I love the ideas you have for decorations, but remember we're going more for an evergreen look than icy blues and whites! I'm afraid with the poinsettias and lanterns, the snowflakes and icicles will make everything look too cold. We want our wedding to be a warmth in the winter! But if you happen to find more [decoration ideas you and fiancé like], send me a picture so we can decide if we'll need them!"


Maybe just a gentle reminder of theme, and steering it in a direction where she can still help out, but more in a way you envision your wedding.
For the already purchased snowflakes and icicles, maybe taking smaller ones to place on a sign outside or on the gift table so they're there, but not main tabletop decorations or anything?

View Quoted Comment I think I would be alright with her adding snowflakes to the table with seating arrangements. Or possibly somehow making them the arrangement signs. That would be fun. My FH let her know it wasn't our style and she was a little butt hurt. We don't have the best relationship. When she doesn't get her way she has my father convince me. I think part of the issue is that I am finally, politely putting my foot down and she's not getting her way.
It sounds picky and childish, but if all the other decorations are nice quality I don't want to encorporate the cheap plastic icicles and snowflakes. I feel like it looks out of place.

Is it wrong of me to think that? Thank you for your advice!