Arrowsong Ministrel and charisma increases

[Dragios]

Under the arcane archery feature, an arrowsong ministrel picks a number of spells equal to her Cha modifier and adds it to the her bards spell list. She then gains a new spell added to the list at 4th lvl and every 4 lvls afterwards.

What happens if the Cha mod is raised? Does she get spells retroactively, like Int and skill points? Not sure about this.

[Drahliana Moonrunner]

Usually the answer is yes. This also means that you lose spells if the modifier drops.

[CBDunkerson]

Yes, you get additional spells retroactively if the Cha mod increases.

This is standard Pathfinder design philosophy... two characters with all the same options/advancements should have exactly the same end results regardless of the order in which options were added.