The Distant Prologue in which Eleanor and her family's reservations are denied by a racist hotel manager, and she responds by making a phone call and buying the entire hotel.
When Astrid and Michael break up, she confronts him, telling him that the reason their relationship didn't work is not her family's wealth (which he's just cited as an excuse for his having an affair) but his cowardice and his dependency on her to downplay her wealth in order to cater to his feelings of inadequacy as a man. As a kicker, she stops him from packing his bags, telling him he can keep the apartment and that she and their son are leaving.
She also gives him an apology - that she hid her expensive shoes, turned down jobs and charity work in case it might make him feel like he doesn't wear the pants in their marriage.
"I've just realised: it's not my job to make you feel more like a man. I can't make you something you're not."
Then she's shown taking the earrings she'd hidden at the start of the film, putting them on, and walking out on him with her head held high.
The mahjong scene. Basically, Rachel lets Eleanor know that she turned down Nick's marriage proposal in which he was ready to leave his family behind in order to save him from the dilemma to which Eleanor has subjected him in which both courses of action would result in the deterioration of his relationship with his family. In doing so, she proves that Eleanor's assumptions about her were wrong and that she loves Nick enough to sacrifice her future for his and understands how important family is in his culture. She tops this off by declaring that when Nick marries someone else and starts a family, Eleanor will remember that it was only possible because of Rachel's sacrifice. All this is what finally convinces Eleanor that Rachel is exactly the type of person Nick needs. It's made even more awesome by the symbolism of the mahjong game they are playing, and specifically, Rachel's revelation at the end that she discarded a winning tile and let Eleanor win.
Rachel: ...one day — when he marries another lucky girl who is enough for you, and you're playing with your grandkids while the Tan Hua's are blooming, and the birds are chirping — that it was because of me: a poor, raised by a single mother, low class, immigrant nobody.
Topped off with Rachel leaving with her mother Kerry, who doesn't say a word but gives Eleanor an epicDeath Glare. Which was improvised by her actress.
Everything Rachel does at Colin's wedding. First, she brushes off Amanda and Eleanor. Then she sits next to and befriends Princess Intan, a woman so powerful she demanded a whole pew to herself.
