No! Coquette fashion and gingham patters are not pedophillic. Don't let it stop you. If it really bothers you though you can just say you dress 'girly' or 'hyper fem''. Your mother is probably thinking of the original meaning of Coquette which has been around long before the gen z fashion. Coquette is a term for women who are playful and manipulate older men, seeking attention without genuine interest in said men (im sure, dont quote me.). Thats probably why she is shutting the idea down. The fashion/aesthetic Coquette that we know today embraces sweetness, romance and playful femininity through bows, lace, floral designs and pastel colours like pink. As for gingham patterns, i dont understand why shes upset about that. Its a very popular pattern even with older ladies. I work in retail, and a lot of business women actually wear gingham.
As someone who has been interested in coquette for he past 3 or so years there is definitely is a dark side to it and its history such as the older men stuff, fetishization of young girls, the body shaming and talk that bigger girls cant be coquette and girly. I think your mum is just concerned for you as you are still a minor.
There is a lovely side to the community and i dont think the cons outweigh the pros. Never EVER be ashamed of what clothing and fashion you like. Coquette is a beautiful fashion that celebrates women and their femininity. Much love to you.