Her amity minigame is horrible and reliant on incredible luck. You'll either have to hedge your bets with a combo of Luke, Lafi Bedmountain, Incas, Edan and Kina in some order, or just spam greeting, which is going to take a massive amount of energy considering you need 500 amity for her 2nd quest.

Finished her game up to 500 amity in under 60 energy. It really isn't so bad. Use greetings strategically before 100 and 300 to save a bit of energy if needed

Best Combo

Shakas
Kina
Lafi Bettberg
Elma Beere
Garnil

This sequence is better (my record: 24 points)
Kina
Elmos Berry
Lafi limontagne
Garnil
Luke

Kina
Lafi Bedmountain
Luke
Garnil
Elmos Berry

Luke
Lafi Bedmountain
Kina
Incas
Edan

or risky but more points:

Luke
Lafi Bedmountain
Kina
Edan
Incas

she is hot isnt she

She is located up in Western Guard Camp.

P.S: Currently a bug in the game in which she will not appear if you have completed the main quest storyline from the Black Spirit up to Kama pt. 2.

How can I get the knowledge of her under the category node managers balenos???

-Lafi Bedmountain
-Elmos Berry
-Garnil
-Jamey Drucker
-Edan
başarılı bir kombo

Worked best for me, but very luck dependent...
Shakas
Incas
Orwen
Luke
Edan

It's virtually impossible to obtain the letter you need to complete Jarette's Support. The instance of her that is supposed to be in the Western Camp is just simply non existent. And the instance of her in Heidel has no options to talk to her.
I sent the devs a ticket about the bug twice and only ever gotten a halfass reply telling me to just do other quests in the area. They don't think I already did that?
I've had to just come to terms that I will never, ever finish this quest line.