What does the red imply?

[v0031]

"Beep! Beep! Beep!" The alarm clock rang three times. Juanita turned the alarm off and looked at the clock. She closed her eyes and wondered why she had to wake up at 4:00 A.M. to go fishing.
"Juanita! Wake up!"
Juanita rolled out of bed quickly and got dressed. As she and Uncle Jack walked out the door, Juanita's mom handed her two bags. "One is for breakfast, the other is for lunch," she said and kissed her on the cheek（脸颊）.
In the truck Juanita asked Uncle Jack a million questions. "What kind of fish will we catch? When will we be at the lake? What will we use to catch the fish?" Because it was Juanita's first fishing trip, Uncle Jack peacefully answered each question.
Finally, they arrived at Lake West Point and put on their lifejackets. As they got in the boat, Uncle Jack gave Juanita her first fishing job—untying the boat from the dock. She put one foot up on the edge of the boat. Plop! Into the water went one of the bags. "Oh no! Our lunch is gone!" Juanita cried.
But she soon forgot about the lost lunch. Uncle Jack found the perfect fishing spot. He showed Juanita how to bait the hook and throw the line into the water. Faster than you can say "catfish," Uncle Jack caught a fish. "You will get your turn," said Uncle Jack.
A strong wind began to blow. "Uncle Jack, do you think it is going to…" Juanita's question was interrupted by a tug on her line. She had caught a fish! She could not wait to compare her fish to Uncle Jack's fish.
Imagine her surprise when her hard work only brought up plants from the lake!
"Fishing is fun," Uncle Jack said with a wink of his eye.
Before Juanita could answer, the sky opened and hard rain fell.
"So, Uncle Jack," Juanita asked, "is fishing always this much fun?"
Uncle Jack laughed as he handed Juanita a raincoat.

[I spent the winter writing songs about getting better]

It's a rhetorical statement to illustrate both that she only brought up plants from the lake instead of fish, and how surprised she was by that. The story leads up to setting expectations she would catch fish, and then implies she did catch one but then immediately subverts that with that statement, she catches no fish and what she thought was one was just getting her hook caught on plants in the lake that she mistook as a fish bite.