You've got the right of it. Stronger buffs always take precedence. They don't actually overwrite funny enough. Say you did Embolden then Cecil's LB on the same turn. After turn 3 and Cecil's wears off, you'll still have the Embolden effect for another two turns. Only other thing to add is buffs and debuffs stack so you can't overwrite a debuff with a buff, though you can cancel it out or still have a gain, IE Full Break + Embolden would give you +10% ATK and DEF.
Depends on your team. Her Sea King Chop and TM axe aren't bad at all though it's not top end. DPS wise I'd roughly throw her somewhere under Bartz without her TM since there really aren't any other decent options. If you have her TM and DW she'd be right round Lightning IMO.
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