First of all, congratulations to your cousin, wishing her a happy wedding and a long and happy marriage. In fact, marriage itself is a very happy thing, so the gifts should be mainly festive, such as a red cross-stitch with a big blessing character embroidered on it. Such a wedding gift has a good meaning and can express blessings to your cousin.
Of course, you can also give your cousin some commemorative gifts, such as a crystal music box, customized with your cousin's wedding photos, accompanied by a wedding march, which is a good commemorative gift that can be preserved forever. Another example is a real wedding doll, customized with photos of your sister and brother-in-law. The effect is realistic and fun, and it can also be preserved forever. Such a gift will make your cousin feel very happy when she takes it out after marriage, because it is given by her cousin, hehe.