Well, we do have training topics for this kind of thing, but I don't really care. Here's some tips anyway.
Don't alt spam with her a lot.
Don't be afraid to use missles if you run out of ammo for other weapons;samus' missles home in on enemies.That doesn't guarantee a hit however.Magmul can be a devastating weapon if you use it right.If you need to get to a hiigher spot, you can go into Morph Ball and lay bombs to boost you off of the ground
All day every day.