Edge (and Vibe, to a certain extent) is really dependent on the counselors and kids. The Edge space, especially on the classics, is a hang-out/Arcade space. Unlike the Clab, there aren't many activities to do outside of structured programming. That being said, there are video games, some form of a board game, and a craft always available in the space. Once tweens get to know each other, the dynamic changes and Edge becomes more of a meeting place. The tweens will pop in and out to see who's around before heading off to a movie, meal, or the pool. Some examples of Edge activities include Video Games, Bingo, Scavenger Hunts, Gaga Ball, and crafts. Since Edge kids are within the weird middle school age, the counselors tend to be slightly less involved than in the Clab, but still more involved than in Vibe; they will usually encourage participation in activities. Not to gender stereotype, but the girls tend to engage in quiet activities like animation cells and other crafts. In contrast, the boys tend to be loudly involved in video games and Gaga ball, which sometimes seems intimidating and scares of quieter individuals. If there's a craft or activity that your daughter enjoys, she can always ask a counselor. They're usually more than happy to get that craft, play a card game, or start up a round of a game.
Vibe has a slightly different "vibe" (excuse the pun), and from my experience, the teens hang-out in Vibe more than tweens hang-out in Edge. For activities like Heroes vs. Villains, Bingo, Trivia, and Gotcha! there's a slight competitive atmosphere, but its definitely in a fun way. One of Vibe's big draws (that hopefully will continue when cruising resumes) is Smoothie Hour, which Edge sometimes gets to participate in. The counselors in Vibe really try to get to know the teens while maintaining a chill vibe, and the counselors contribute positively to the overall experience.
If you have any specific questions, I'd be happy to answer them (I also have posted a couple other times about Edge and Vibe specifics)o