Planning a special birthday surprise for your long-distance girlfriend can help bridge the physical gap and make her day memorable. Start by coordinating with her friends or family who may be nearby to ensure she doesn't spend her birthday alone. Arrange for a surprise video call or virtual party with her loved ones to create a sense of togetherness. Sending a heartfelt, handwritten letter or a care package filled with her favorite treats and meaningful items can show your thoughtfulness from afar. Another idea is to order food delivery from her favorite local restaurant to her doorstep, allowing her to enjoy a delicious meal even if you can't be there in person. Consider planning a future visit or getaway to look forward to, showing your commitment to the relationship. Remember, it's the effort and thought you put into making her feel special that truly matters in a long-distance relationship.