I kind of like it a little sad desu. Like Abigail still gets on real well with her friends, but they've changed so much, and she has to keep herself the same and stay mentally a child. Because she's so good at what she does, she can fake it among her peers, but inside she feels distant to everyone. Too old to associate with kids, but too young at heart to relate with people her own age.
She does have the other teen agents, though, so it wouldn't be all bad. Maybe she'd even end up blowing her cover with her old teammates which would give them all a secret to bond over, even thought they'd think it's weird. It wouldn't be the happiest thing ever but it'd be interesting. Less sad at least than one of their friends being shipped off to space. Imagine being decommissioned and trying to figure out what happened THERE.