"I heard this horrible noise on the baby monitor from the nursery, and bolted over there.
"Luna was shaking and convulsing. She was deathly pale and was having problems breathing. If I hadn't had the course, I wouldn't have known what to do and would probably have panicked and clung on to her, which can be dangerous.
"But then the training kicked in and I knew I needed to stay calm. I put her on the floor in the recovery position and called 999."
Emergency help arrived in minutes, and they were all rushed to hospital.
A urine infection and a fever peak of 40C are believed to have triggered the seizure.
Luna is now well, but Zoe says: "If I hadn't known what to do when she had the seizure, it could have been so much worse. It was so lucky that I'd had first aid training."