My suggestion is to go to your girlfriend's home in a different city and bring her a most thoughtful birthday gift. This will not only surprise your girlfriend, but also make her family look at you differently and feel that they can entrust your girlfriend to you.
Of course, if conditions do not allow, you can send the gift you choose for your girlfriend to her home by express delivery. Beautiful cartoon bouquets, cute plush dolls, sweet birthday blessing chocolates, exquisite name necklaces, and romantic crystal music boxes are all good choices.