Hideous !!! Falling apart!!! Peace offering???

My mom and I haven't gotten along in years. My sister told her I was getting married, she called & said congrats. I told her she could attend providing she could behave w/ my step-mother there. Today she showed up @ my home w/a "centerpiece" for the head table. I had told her that I didn't want anything extra for that table and that the venue didn't allow lit candles, blah, blah, blah. She didn't hear a word! It doesn't match my theme or colors and it is poorly constructed (pieces are falling off!) My family says just to bite my tongue cuz it is her way of making peace. I think she hasn't changed a bit and this is just rude! What do I do? I don't want to use the centerpiece but if I don't it will cause another fight! Why couldn't she just listen when I told her I have everything covered?! Is she just being spiteful because I didn't include her in the planning?