The reveal in episode 2 that Ange and Princess Charlotte swapped identities in the past puts all of their previous interactions in a new light. For example:
The reason why Ange is chosen for Operation Changeling is due to her skill at impersonating Princess Charlotte, because she actually is Princess Charlotte.
Princess Charlotte acts very friendly with Ange, who by all accounts should have been a complete stranger, and in contradiction to Dorothy's observation that Princess Charlotte does not go out of her way to make friends. However, it turns out Ange and Charlotte already knew each other.
The entire opening conversation between Ange and Princess Charlotte is a veiled way for Ange to confirm her identity to Princess Charlotte without tipping off Beatrice or Dorothy.
Princess Charlotte mentioning to Beatrice that she'd rather be friends with a lying devil. Both she and Ange are effectively living a lie, making both of them "devils".
Princess Charlotte musing that some lies have the potential to become truth, while gazing a family photo of "herself" with the Queen.
Why the hell would Ange and Dorothy allow Beatrice, of all people, to keep the pen-gun, after Charlotte nearly shot someone with it? There's a decent chance a small gadget like that can only fit one shot in the first place. There would be no danger in giving it to Beatrice, and letting her think she was armed would make her more comfortable in going along with the mission.
In the English Dub, Beatrice possesses a deep voice, making her sound a lot older than her actual age is. However due to Beatrice's past, it's likely she doesn't even know what her actual voice sounds like and the choice is born from the desire to present herself as powerful to show that she can protect her beloved princess.
While we get visuals what Charlotte (the real Ange) had to go through to become the Princess, we aren't shown what Ange (the real Charlotte) had to deal with when she was stuck in Commonwealth. From the looks of the place, it isn't far off that child labor and prostitution was part of the everyday life. Whatever Ange went through that the next time she met Charlotte, she just wanted to take the Princess to Casablanca and stay there.