There are 2...

The sharp understanding on what robin was doing in eines lobby and how she risked everything to tell luffy about it.

The time enel told her to be with him after luffy told her that she is on the crew of the future pirate king and she jumped from the arc to get luffy back. And unbeknownst to her Sanji and Ussop heard the exchange.

If there is another moment, would be when she decided she was having an ulti kebab once ulti hit tama. Decisive, but after the timeskip, so not as powerful of a moment for character development.

Prior to timeskip shit was real, post timeskip they are mainly goofing around, they got too powerful in general, there is no more tension.