[quote=@MelonHead]
I heard once that if a roaming black hole did wander into our solar system it would launch all the debris and asteroids nearby into the planets, destroying them before it even had to do anything. 

I don't really get space very much, we have a complicated relationship.
[/quote]

Her entire focus was pushing against the black hole itself so we can just assume other characters dealt with the debris while that was going on. If she can do that, other people could stop asteroids, even if they were only as powerful to her as Krillin is to Goku.