Also I feel like people just know MAC as the punchy person that they don't really consider what her backstory is.

With Gillen's expansion of the character. She's a 17 year old, yes. But she's a 17 year old who's been traversing the multiverse since she was 4. Meaning she has 13 years experience seeing everything that's everything in the Marvel Multiverse. Something that can't be said of any of the other heroes in this team. Even BP during Hickman's run only got to get glances of an already dying multiverse and only for a few months as opposed to MAC's years.

Before her time in Young Avengers(which she mainly joined for the sake of keeping a close eye on Loki to ensure he doesn't screw over the progression of the magical foundation of reality). She was joint team leader of the newest iteration of Teen Brigade.

Teen Brigade who's modus operandi was to covertly deal with issues in the marvel Universe as a whole. Which included saving the Inbetweener(A marvel cosmic), Preventing Loki from falling into the hands of the master's of Evil and keeping Latveria from being toppled.

The Ultimates is MAC's bread and butter in terms of business. More so than everyone else on the team except for Blue Marvel.