My suggestion to you is that you must know your sister's interests and hobbies better. You can choose a birthday gift for your sister according to her hobbies. It is definitely a good idea to give her a birthday gift that she likes. You can get to know your sister better and then choose a gift!
In fact, it is not bad to give your sister a more thoughtful birthday gift on her birthday, such as giving her a skirt, or buying her a scarf, coat, etc. Such a birthday gift is more thoughtful, and your sister will definitely be very touched.
Of course, you can also give your sister some personalized birthday gifts, such as a customized name bracelet, necklace, engraved ring, earrings, etc.
Finally, I recommend birthday gifts for your sister, such as customized cups, pillows, crystal music boxes, etc., as well as novelty sun jars, or very cute dolls, cartoon bouquets, plush gifts such as dolls. These gifts are all good choices for girls!