The only moment I remember was the feat of the galactic core, Storm handled enough energies to sweep the entire solar system!
The interesting thing is that her body didn't disintegrate, she just went into a coma, a consequence of dealing with so many energies in a few seconds, and having to reach this entire Galaxy!
But now talking about times when Storm had to deal with extensive energy sources, I think her biggest moment was in Trion's feat, she had to channel energies from an entire dimension and then heal him, if I'm not mistaken this dimension had multiple worlds!
She also had to close a spacetime crack