The action takes place at school during gym class. Kids are playing volleyball. And one of the girls accidentally hit a boy on the head with a ball. She walks up to him to say sorry.

Bella: "I'm sorry I told them not to let me play."
Boy: "You're Isabella, right?"

Here comes up another girl and say: "She's got a great spike, huh?"

Could you tell me what she means by "great spike"?

Thanks!

 

Spike- "the act or an instance of spiking (as in volleyball)"

Spiking: to drive (as a volleyball) sharply downward with a hard blow;

M-W Online

 

Does this expression have anything to do with spikes on sports shoes?

 

No. It is instead the very specific term for a way of hitting a volleyball. If I were to speculate, based on nothing at all, I would assume that the term derives from the fact that a real spike (such as a railroad spike) is driven downward quickly and forcefully.