do you want to change the emitter animation or just a frame?
1.- when the ball changes frame
2.- set variable "WhatFrameIsBall" to "2"
3.- create an event:
When System check variable if true "WhatFrameIsBall" = "2"
run code "set particles to frame X"
to the second thing:
Create particles on Layer 0 (or something lower than the one with the sprite). Just pay attention to what layer is the sprite and what layer are the particles.
Another option: Add action "Sprite" "set to Top"