It wasn't a usual surprise to see everyone paying attention to Kousagi, specifically if Kousagi is another child of Neo Queen Serenity and King Endymion. Any child of the king and queen would get so much attention

Chibiusa could never stand it if someone other than her was getting more attention. And Kousagi, was definitely enjoying the attention she was getting.

Chibiusa was trying so hard not to lose it, it's not surprising, she doesn't want anyone getting more attention than her.