Rose: Look, guys, who knows why MI9 chose us? But we're in this together. It's our first mission; we can't afford to mess up.
Lenny: Have confidence, Rose.
Rose: I don't see why we couldn't just handle it ourselves.
Lenny: Love the confidence, Rose. But Air-One want to study the craft's technology and have jurisdiction over MI9.
Something something Rose grew some confidence in herself and her team and believes that they can take on whatever comes their way, as long as they have each other. It's part of the reason why, despite being mission-first, she doesn't oppose Blane when he tells them to go to the gym. She trusts the judgement of her teammates and takes their findings into consideration (just not when personal feelings are involved).