You'll be surprised by how blind people get when it comes to discrimination. They will make all sorts of excuses or accusations to downplay their abilities and/or contribution.Uhmmm I'm a little worried, she sounds a bit too broken xD magic that can literally do anything apparently, but I didn't expect that back story with the hero party... And yet people still don't believe her? something ain't right!!
It's probably more along the lines of her wanting the experience of working up through the ranks, rather than cutting straight to the finish. One would assume that the guild wouldn't really let an S-rank take F-rank quests, and would instead insist on sending them out on the most dangerous quests possible. It was like someone who hadn't even learned to drive yet getting dropped in a rally car and just barely managing to survive to the end of the race. Now all anyone wants them to do is run rallies, but they still just want to get their driver's license.Hmm, her complain doesn't sound like "S-rank quests are too hard for me", so aside from her own wish for "new me, new life", I don't see a reason to start again from the bottom.