Why was it her last time in the babysitting story?

Well, perhaps there were some challenges. Maybe the baby wouldn't stop crying at first, but she managed to calm it down by singing a lullaby. Then they had a really fun time reading picture books together. And at the end of the night, when the parents came back, she felt a sense of accomplishment and also a bit sad because it was her last time babysitting for that family.

The scariest part could be when she heard a strange voice but couldn't find the source.

I don't know the specific details of her last babysitting horror story. Maybe there was a strange noise in the house, or the baby suddenly behaved very oddly, which scared her a great deal.

One lesson is patience. Little sisters can be quite demanding. For example, she might want you to read the same story over and over again. Another lesson is responsibility. You have to make sure she is safe, fed, and entertained. Also, it teaches you about creativity as you come up with games and activities to keep her occupied.

Maybe you had a really creepy or dangerous experience while babysitting that scared you off.

The cheerleader could also try to integrate the two in some ways. For instance, she could teach the kids she babysits some cheerleading moves, which would be fun for the kids and also allow her to still be involved in cheerleading while on the job. And when she has free time between babysitting tasks, she can use that time to practice her cheerleading skills, like doing some stretches or going over the routines in her head.

It depends. Sometimes stories labeled as such are based on real events but might have fictional elements added for dramatic effect.

Maybe she felt she had exhausted her creative ideas for that genre or character type.

Maybe it was a creative choice by the author to create a specific mood or effect.

Maybe it's for a special artistic effect to create a certain mood or atmosphere.