Illness

Yesterday, my daughter went to bed early. I did not pay much attention to this. Today, she did not need to study because there was a school (is an) examination. (at our school and) She could sleep as long as she wanted but (she) woke early. As a rule, my daughter is the best sleeper, (.) so I was surprised. When I saw (see) her eyes, I noticed they were red (, I) and guessed what had happened. My girl felt ill. She had a high temperature. All the day she stayed in bed because of the weakness. I gave her some pills/tablets to combat (against) fever and fed her her favorite/favourite dishes. She drank a lot of (much) tea with lemon and honey. I hope she will be healthy soon.

Nicely written. I hope she recovers quickly.

Illness

Yesterday my daughter went to bed early. I did not pay attention to this. Today she did not study because there was an examination at our school and she could sleep as long as she wanted but she woke up early. As a rule my daughter is the best sleeper. I was surprised. When I saw her eyes, they were red, I guessed what happened. My girl felt ill. She had a high temperature. All the day she stayed in bed because of weakness. I gave her some pills against fever and fed her favorite dishes. She drank much tea with lemon and honey. I hope she will be healthy soon.

Illness

Yesterday my daughter went to bed early. I did not pay attention to this. Today she did not study because there is an examination at our school and she could sleep as long as she wanted but she woke early. As a rule, my daughter is the best sleeper. I was surprised. When I saw her eyes, they were red; I guessed what happened: my girl felt ill. She had a high temperature. All the day she stayed in bed because of the weakness. I gave her some pills to fight the fever and fed her her favorite dishes. She drank much tea with lemon and honey. I hope she will be healthy soon.

I hope your daughter gets well soon.  I'd consider connecting some of your short sentences with semi-colons (;) and commas (,) where possible. :D