AIM vehicles weren't particularly hard to follow. They gave off an energy signature that was very easy to follow (provided you had the super-senses to see such things).
It was probably risky, coming alone, but the other Avengers were tied up with another part of the emergency.
And besides... Caroline was practically an army all by herself.
She dropped out of the sky in front of the AIM base, cape flapping in the wind. She brought up both hands and blew the doors off with a bolt of energy.