Selecting a birthday gift for your long-distance girlfriend requires extra thought and effort to bridge the physical gap. Consider sending her a care package filled with items that remind her of you, such as handwritten letters, her favorite snacks, a cozy blanket, or a book she's been wanting to read. You could also plan a surprise video call to celebrate her birthday together virtually. A thoughtful and heartfelt gesture can make her feel cherished, even when you're miles apart.