As others said remember Miqo'te are clan based but not isolationist. They've heard of and seen guys like Paladins, and not everyone can be a hunter. It's very reasonable that maybe your character thought 'huh those guys in Ul'dah seem to have it worked out, maybe I'll take that up to protect my clan'. She'd be seen as a bit of an odd duck but no one would, like, cast her out for it.
Maybe in her mind the best reason to go with that style of armor is that, for example, there are some animals that you just can't outrun easy. Speed and precision are nice but sometimes the monster is faster, so she figures she can be the kind of hunter that stands up to even the big threats.
Hell you could go full tribal and have her base this concept off something like an adamantoise, RP her armor painted up like one of their shells or the like?
Maybe in her mind the best reason to go with that style of armor is that, for example, there are some animals that you just can't outrun easy. Speed and precision are nice but sometimes the monster is faster, so she figures she can be the kind of hunter that stands up to even the big threats.
Hell you could go full tribal and have her base this concept off something like an adamantoise, RP her armor painted up like one of their shells or the like?