Why is my best friend upset with me after her dog was put down?

I am annoyed with her, she texted me on Saturday that she might have to put her dog down, I called her as soon as I saw her text and no response I then texted her this long text and she responded like 10 hours later saying thank you bestie with a heart. I followed up with did you have to put him down today? with a sad face and I never got a response, I texted her today saying guess you didn't get my text and she responded to me by saying I did get it I just didn't like how it sounds and that she isn't mad or anything blah blah, I don't know but it pissed me off because I was with my boyfriend that they and literally called her the second I got the text. So for her to say that she pissed me off, I even got her a keychain memorial gift that day and I still yet to receive it. But why would she say that?

Why is my best friend upset with me after her dog was put down?
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