did I handle this correctly?

client booked 4 days overnight but called me the morning of (after m&g) to let me know she didn’t “need” for me to stay the night. I was confused and said ok, but followed up in text (I wanted it in writing).

I offered a discount as it was day-of. Should I have done anything differently? She is extremely annoyed with me/not responding to the photos she requested of her pet.