AITA for not responding to my ex best friend about her dying dog?

I (26F) had a best friend (31F) who I was super close with because of work. So I’ll start off from the beginning. We had been friends for 3 years up to this point and I had gone through a lot of situations for her and just brushed them aside and always thought this is what friends do for each other.

Some of the situations being her and her brother, who were both intoxicated at the time, fist fighting each other in my car and then her pulling him out of my car. Then convincing me to leave our international trip that was in South Korea a couple of days early because “her dog needed emergency surgery”, come to find out after we stopped talking it was never true she just hated South Korea and wanted to come back home and had switched her flight without me meaning she was about to leave me stranded alone for 4 days. Then also writing a letter for her to use in court saying how she’s a good person and to let her keep her professional license. That’s just to name a few things.

But we stopped talking when my grandmother passed away last year and I was with her when I got the call and I immediately left her house and rushed over to my grandmas. She told me to text her when I got there and I did text her and I put my phone on DND for 2 weeks. I was a hermit besides going to work during that time. By this time she had quit our job and she no longer spoke with our friend group. In this time that friend group wanted us to hang out to distract me with everything going on.

Finally when I take my phone off DND I see I had two calls from her and I call her back. She then answers the phone very monotone and ends up saying nice to have you call you me back I apologize and tell her that I haven’t talked to anyone or used my phone. She forgives me and we move on. You would think that she would be understanding especially after knowing how close I am with my family and meeting my immediate my family in previous events but again nope. Then a couple days later she says how I’m not responding to her messages quick enough and I again apologize. She never responded to that text but would sometimes send me memes on Instagram. Then slowly our friendship fizzles out in a month after that. I started thinking about everything and thought it was maybe for the better at this point.

Then 6 months later I get a text from her saying that her dog has cancer and if I would like to see him one more time then to let her know. My friend group that she no longer talks gets the same text as well. We all felt like this was her way to get into the friend group I didn’t care to respond after how she acted towards me. So am I the asshole?