My daughter is sick.

My daughter has a high fever from last Tuesday but I thought that it is just a passing cold. The fever hasn’t gone down and she has started a bad cough.
Eventually she was diagnosed with pneumonia and hospitalized yesterday.
She is getting better but needs to stay here until this Sunday.

My daughter has had a high fever since last Tuesday, but I thought it was just a passing cold. The fever hasn’t gone down, and she has developed a bad cough. Eventually, she was diagnosed with pneumonia and hospitalized yesterday. She is getting better but needs to stay here until this Sunday.

Note: I made some corrections to the punctuation and tenses. However, if you are truly in this situation, I hope your daughter recovers very soon. Please take care.