Read the following text carefully!

    I borrowed my best friend's novel last week. I liked reading it while having a cup of tea. When I was reading it seriously, I tried to grab the cup. I wanted to drink my tea, but I accidentally poured little tea on two pages. I was confused to clean the tea stain. I tried really hard, but it couldn't be cleaned.

    Then I went to my friend's house at once. I needed to tell her the accident. After I reached there, I only saw her mother.

    "Good afternoon," I greeted my friend's mother. She was doing gardening when I came.

    "Good afternoon, Winda," my friend's mother replied me nicely.

    "Could I meet Sandra?" I asked for permission. Then my friend's mother came inside the house to call Sandra. She also asked me to sit and to wait for Sandra in the living room.

    "I've told Sandra that you're. here. She'll go down stairs right soon" My friend's mother came back to me to inform me that. I thought that she was just from Sandra's room.

    "Would you like to drink?" asked my friend's mother.

    "No, thank you for offering," said I.

    "Please enjoy yourself. I must go back to the garden," said my friend's mother.

    "Sure," said I Then my friend's mother left me. Not so long, Sandra came and met me.

    "How have you been?" asked Sandra.

    "Not bad. Sandra, about your novel.. ... "

    "Have you finished reading it?" asked Sandra. She interrupted me.

    "Not yet. I have done something bad to your novel."

    "What is it? What happens?"

    "Well, there's tea stain at the page 102 and 103."

    "How come?"

    "I tried to drink my tea while reading it, so the tea was accidentally poured."

    "Let me clean it."

    "I've tried, but it didn't work. I'm sorry about that."

    "Well, that's okay. The text can be read still," Sandra smiled. She forgave me. I felt okay after hearing she say that.

    "Thank you for forgiving me."

    "Not at all."

What did Winda do after she couldn't clean the stain pages?