Spells A nymph casts spells as a 7th-level druid, but cannot swap out prepared spells to cast summon spells.
If a nymph takes at least one level in druid class, and thus gains Spontaneous Casting class feature, does it apply to all spell levels she can cast?
The levels stack so I would vote yes. However, I don't see anything written down anywhere in the Bestiary or elsewhere beyond the caster levels stacking. All one-off monster-character builds are at the judgement of the referee so do it as you see relevant to the encounter.