If you look back at one of the first pages with Katie and Grace, Katie seemed to be looking at Grace's chest in a unhappy way.
I think Delphi was known for have a bombshell body, and Grace has followed in her footsteps. Katie is intimidated by being compared to the infamous Delphi's granddaughter physically.
Thought so. Her genetics are definitely bombshell quality to even influence her grandchild like that is amazing. Her dad probably looks like Thor of asgard if we are talking about genetic potential.
That's assuming she has seen annie. The building is big and if they weren't friends before then they might not hangout so much since charolette "died". A drifting apart of sorts
I think Delphi was known for have a bombshell body, and Grace has followed in her footsteps. Katie is intimidated by being compared to the infamous Delphi's granddaughter physically.
...so, her problem is with Grace's chest.