Becoming an Alumna

I graduated a semester earlier than what was planned and told my little about it and showed her the dean’s email right before Christmas, and that I actually won’t be returning to the chapter because of that…and she won’t talk to me?!???? We’ve always had an amazing relationship and we’ve never ever had any issues or fights before. i’m so shocked that this small thing is driving a wedge between us. She left me on read and I tried reaching out to her again but she left me on read again. She’s literally on social media and posting on ALL of her socials, but she can’t respond to me or at least voice how she feels? How is me telling her the graduation news the start of a bad relationship? Huh? what? what can I do?