I checked on Bulbapedia, and I don't think she's supposed to say that. It's an Eevee.
>"It looks really happy! It must love you a lot." 250-255
"I get the feeling that it really trusts you." 200-249
"It's friendly toward you. It looks sort of happy." 150-199
"It's quite cute." 100-149
"You should treat it better. It's not used to you." 50-99
"It doesn't seem to like you at all. It looks mean." 0-49
Its between 100-149 happiness