IH, I think it's a GOOD thing that you didn't reply to her right away. It was a genuine mistake, but also it shows her that you're not sitting on your phone waiting for her to call/ text and you're not immediately available when she needs a stand-in husband.
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Well I just left her a brief voicemail apologizing for missing her message and offered my condolences and gave her the vet advice. I left it at that.
Perfect! Now quit beating yourself up, you handled it great!
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However now I'm sure she's going to call me back.
First, don't fret over whether she's going to call or not. Second, if she calls then deal with it then. Remember like Steve said, she fired you. If you worked as a ditch-digger for me and then I fired you but then suddenly called and said "OMG I have an emergency! I need you to dig a ditch right now! LIKE RIGHT NOW! But I'm not going to give you a job or pay you for it." Would you do that? THIS IS THE SAME THING.