A couple of weeks ago my manager mentioned that there would be training coming up after work and that she'd let me know when. Didn't hear anymore until I went to work yesterday and another colleague casually mentioned that the training was happening that very afternoon. I was surprised and slightly mortified as it's an important course and now I couldn't go as I couldn't get a childminder at such short notice. My colleague was surprised I didn't know. It's not the first time I've been left out of the loop (I'm part time and it's a continuous issue) and I felt a bit annoyed. However, I politely explained to my manager I didn't know it was that day and wouldn't be able to go and could I have some written info instead. She said that was fine.
Then I got home last night to find a snotty text message from her saying that she knows that she did tell me when it was and accused me of trying to make her look bad in front of other staff when I'd obviously just forgotten. I was shocked and upset.
I am so sure she didn't tell me when it was because if she had I would immediately have thought that I would need childcare, I would not have forgotten that. There is no text or email from her confirming the date and time either. It's horrible being accused like that on a text message, I haven't responded to her yet but I don't know what to say. I'm known for being an easy going non-confrontational person so I'm hurt she thinks I would deliberately make her look bad. I'm also annoyed that she has done something so unprofessional even though I've tried to stay polite and professional.
How do I reply without jeopardising my job?