I can feel your pain; you two have been friends for what might feel like an eternity, and I can relate with how it hurt when she didn't stand with you.
I understand that this may not be the one and only thing that may be weighing down on your heart--but I would like to offer my two cents. This may sound incredibly cliche/predictable, but I feel that communicating your feelings in this problem with your friend could better connect you and her in the light of the issue. You may express to her that you felt as though she became distant in a time that you needed her; perhaps she doesn't know that she is being one-sided, and it could very well be that she refrained from visiting so that you can heal and have time to yourself after your surgery (but then again, making and denying plans that you two accepted/discussed is quite strange).
Perhaps let her know that you care about her, and that you love her as a dear friend--express that she's important to you--but also let her know that you need her support, too. Perhaps remind her that you're feeling down, and you need someone there for you--like her.
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