If you both were close and somehow it has changed, then it’s a worry. But it doesn’t mean it necessarily has to do with you. Because you have not yet confided in her, you need to do it to know. Iam sorry, i pray things get better :(
I hope it doesn’t have to do with me. But we aren’t close, I don’t really even know her, so it’s hard for me to predict her. Thank you for your prayers.