Quote Originally Posted by Puck View Post
When her MP's not recovering, you rezone? That means you're resummoning her, too. You can resummon an NPC without zoning. Just click on her to bring up the mini-menu and pick "Release," then cast her Trust spell again and she'll be back with full MP (provided it's been at least 3 minutes since the last time you summoned her).

Other than that, Trust NPCs have high hHMP and hMP between fights, so just try to take a 20 second break every now and then.
Wow I feel real dumb then... I recently started playing so I had no clue there was even a menu when I click on them. Thank you so much this makes everything just 100 times better now!