Need advice please!!

So my roommate and I were super close last year!! It was so much fun and had a great time but ever since we have been back to school it hasn’t been the same. I don’t know if I did something or not. I saw her over the summer once but we both had to work so we couldn’t see each other much. We kept in contact over text and Snapchat. I thought maybe it was just me or since it was the beginning of the new semester but even my other friends said are you and “my roommates name” okay? I invite her to things and try to hang with her but she mainly hangs with people in her major which I understand but I don’t like being left in the dark because we have different major because it didn’t matter last year. I thought maybe things would change a bit as time went on but doesn’t seem like much has changed back.