Much like how Captain America: The Winter Soldier was set in the present following Steve Rogers being thawed at the end of Captain America: The First Avenger and helping ward off the Chitauri invasion in The Avengers, it’s likely that Captain Marvel 2 will follow Carol acclimating to modern times after teaming up with Earth’s Mightiest Heroes in Avengers 4.
Since Monica Rambeau will be a child during Captain Marvel, obviously we won’t see her kicking any alien ass.
It would be a waste for the MCU to introduce Monica in Captain Marvel and not deliver that payoff later on.
However, perhaps she goes through something during the movie that lays the groundwork for her superpowers fully awakening as an adult.