Gift for coordinator/friend

My close friend is an incredible professional wedding coordinator, and she generously offered (we never even asked!) to help us coordinate our wedding for free! She is extremely busy as a professional coordinator & we'd never want to take advantage of her kindness, so we have always tried to do most things on our own. Even so, she has still helped me plan, organize and problem-solve without ever complaining or making us feel like we were encroaching on her time. She has even pulled strings for us with other vendors for discounts. I want to give her a nice gift on our wedding day to thank her, but we can't afford that much. I've seen the wedding coordinator badass mugs and chaos coordinator mugs/glasses, but those don't quite feel like enough....any gift ideas for her? I'm hoping to stay at $50 or under. Thanks!