Does Abby slap kate??????

No, but she does slap Ziva in Hiatus part 2 because she thinks Ziva's actuación as if she doesn't care about Gibbs' condition {he's in a coma} Ziva slaps her back, then Abby slaps again then Ziva. McGee watching in awe, later tells Tony making Tony say "And I missed it?!" :P

No. I've never seen an episode where she did. She did slap Ziva though. That was in either Hiatus Part 1 o 2.

No, but she does slap Ziva in Hiatus part 2

no but she does ziva

Abby slaps Ziva, then Ziva slaps her back.

she slapped ziva in hiatus