Instructions
Ignore Jill the first time you encounter her in the level "Blood Runs Red." She and other wyvern riders will appear on the battle map around Turn 4. You cannot recruit her at this juncture, and should instead focus your energy on reaching the boss of this level.
Look for Jill to appear again in the level "A Strange Land." She will appear on the south part of the map around Turn 2.
Move Ike and his army near Jill and she will join your party.
Use Jill to help your party beat Seeker, the boss of "A Strange Land." Jill has the Laguzguard equipped so she will take little damage if Seeker attacks her.