Her daughter Sophia became ill very quickly.
Rosanna Davison has advised other parents to be aware of the symptoms of scarlet fever after her daughter had to be taken to hospital this weekend.
The model explained the frightening ordeal on Instagram, but added that her three-year-old daughter is doing much better now.
She had uploaded a photo from a family walk and explained that Sophia became ill afterward.
"Never a dull day," she wrote. "She's totally fine now. I'll tell you what happened once I have a quiet moment."
Later, in a series of videos addressing her followers, Rosanna urged parents to be on the lookout for symptoms of scarlet fever.
She said: "A couple of days ago Sophia had a temperature and was complaining of a sick stomach so I kept her home from school.
"Yesterday morning I took her temperature and it was fine. I did feel she was a little quieter than her normal bubbly self but we headed out for a walk anyway and met my brother and my parents.
"We weren't out that long when she really began to go downhill. She developed a flushed red rash across her face and little red bumps. But, it was her tongue that gave me the biggest fright.
"It was bright red, little sore bumps all over it - quite similar to the rash on her face - and a white coating in the centre. She was drowsy and lethargic and was developing a temperature at this stage. She also fell asleep during the walk which isn't normal for her."
Thankfully, Sophia received treatment very quickly once they got to a hospital.
"The doctor diagnosed her with scarlet fever and prescribed a 10-day course of antibiotics, which she has responded to already."
For information on scarlet fever, head to the HSE's website
right here.
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