WaterShuriken
"I..I..Iron Tail, Pikachu."
I prefered her before. Shes super boring now without a personality
That's not totally true. Chloe still has the same personality, it's just not directed at Ash and Goh now. We saw a bit of it when she encountered the Impidimp.
It makes sense for a closed off person's personality change once they grow accustomed to someone.
We see that she gets really excited for people she cares about, for example Goh in the Eating Contest or Chrysa when trying to reunite her with her "love."
I'm sure she'll get there eventually with Ash, but we're not there yet. Even Yamper stopped barking at Ash. Ash even walks Yamper when Goh and Chloe are at school apparently.