tower with a javalin and only get her to attack the boss and kill everyone else with a
stronger person

before you enter the black temple (the final stage), train her at the Tower of Valni.
bring her with another strong character, like Seth or Ephraim.
first, allow Ephraim or Seth attack the monster or the boss (the monster will have
damages, but it's not die).
then, let Amelia attack it.
if the monster die, Amelia will gain more experiences.
this tips also works with Ross and Ewan.

note:
you know? Amelia, Ross, and Ewan are strong characters if you trained them a lot and
promoted them into the next cl***.

before you enter the tower of valni, select 3 of your best charectors who can take hits
without really losing much health, take away there weapons and select the other three
tranies and make sure they have ranged weopens,send the three players who can take damage
and move them to the front of the steps, and take two more people to guard the sides, send
the traines right up behind the three strong people, and when the monsters come to attack
the strong people, just throw your javalin, magic, or hatchet, the monsters cant get to
them! that is how i did it!

In that chapter, don't let amelia attack just let her retreat.
and then go to the tower and then choose 3 or 4 of your best defenders and sorround amelia

(NOTE: make sure she has a ranged weapon like javelin etc.)