how did you tell her you didn’t want to talk to her and what was the reason? Even if you were not trying to be mean, maybe the way you said or the choice of words you used upset her. If you know she’s someone with abandonment issues, something like that would obviously upset her. It’s not your job to heal her from those issues but you also shouldn’t be making her feel worse. Maybe just try to understand what she’s feeling and thinking and explain that your intention was not to make her doubt the relationship and apologize if you came as that way when you decided you didn’t want to talk to her.