There are ways to boost will or int (studying at libraries increases INT
and training with Carla at the bazaar past will increase your WIL after you max out your HP bonus, for example), however inhibitions only ever go down.
You can use the debug tool (named "travel sphere") and inside the room you are teleported to there are a few colored globes you can interact with to change Erica's stats, but there is no proper in-game way to raise INH.