The best gifts for her strike a balance between comfort and style, and casualwear is one of the safest categories to shop in. An oversized hoodie in a flattering neutral tone works for almost any style preference, while a soft, well-fitting graphic tee adds a bit of personality without being too bold a guess. Look for quality fabric — she'll notice and appreciate the difference in feel.
If you want to add a personal touch, pay attention to colours she already wears often, since sticking to her existing palette makes a gift feel more considered. For an easy, foolproof option, a gift card lets her pick pieces in her own size and style, which is especially useful if you're not entirely sure what she'd choose herself.