Choosing a birthday gift for your girlfriend, Shaina, involves considering her unique personality and interests. Think about what she loves and enjoys in her free time. It could be a personalized piece of jewelry, a spa day to pamper herself, or a weekend getaway to a place she's been wanting to visit. Another thoughtful option is to plan a surprise birthday party with her close friends and family. Whatever you choose, make sure it's something that shows your love and appreciation for her.