Suika didn't blow up the moon. She blew up a reflection of the moon, as a display of her power (in retalation to the Scarlet Devil Mansion's anti-oni celebration, which was done in retaliation to IaMP, as per Patchouli's storyline). She explains the process to Aya in that BAiJR interview.
The whole "You can influence the appearance of the moon using reflective surfaces" thing was a secret (something that Suika told Aya in that interview), so Suika either figured out how to do it herself or she learned how to from her friend Yukari (given Yukari's propensity for playing with the moon via reflections)
And yea, she grows huge in several games (pretty much every game she's been in, really, not including SA). If you're trying to research characters for a story or something, I recommend you not only read their profiles, but also take a look at all of their spell cards as listed in the Wiki in the game sections. Spell card names, ZUN's/Aya's/Hatate's comments on them, and the danmaku functions themselves all tell many things about a character's abilities that simply reading the literature won't.
