Not too mention we don't have a full account of her activities during the 5 year gap. I imagine the Avengers had plenty of fires to put out on Earth before she decided to book it off into space. And i imagine the "She blew up Thanos' massive Space ship" story has reached a few ears.
- - - Updated - - -
I don't think they are holding back on "stretching powers" because they think it would look bad. I think it's more likely they are keeping those powers reserved for someone else...
- - - Updated - - -
Well, there is a non-zero amount of those types that were already checked out as soon as they saw the main character is a Pakistani-American Girl.