Is this okay?

I had texted my employer I wouldn’t be able to make it into work since me and my bf got in a car accident and we are down to one car. He’s in the military so obviously his job takes priority over mine. I forgot to text her the next day because I was sore and slept for most of the day. She hit me with this this morning. What should I say/do? I feel like this is unacceptable because I’m one of the best employees and now I’m just upset.