Aria chose the wrong job. I'm not saying she should feel nothing, but it's the simple reality that some adventurers won't return alive. That's what being an adventurer is. She'll die inside if she doesn't learn to accept it. The guild master as well... How the hell does he expect adventurers to grow up if not by challenging themselves? By sitting behind a desk, huh? Fighting immobile practice targets?
High luck is the best attribute you can have. That's why wise players of old Elder Scrolls persistently placed one point on luck every level up, even if they otherwise maxed the multipliers religiously on two normal attributes.