Excited grandma 😞

Let me just start off by saying that I'm 20 years old and my baby wasn't exactly planned. My mom has always been so eager to have grandchildren. Now that it's become a reality for her, she's buying everything and coming home with new baby stuff every week. As much as I appreciate everything she does and how much of a big help she is, I feel like she's taking away my responsibility. Am I over exaggerating? Should I talk to her about it? I already feel bad to begin with that I got pregnant when I wasn't ready but this makes me feel worse.