Elena’s a strong, independent woman, with her own motivations and thoughts. She’s indeed attractive (very attractive if you think about Uncharted 4), but in terms of being healthy and fit, not being overly sexy as a “fan service” (Japanese games, I’m looking at you)
She’s not some female characters who are over-confident, and/or over-powered, to the point they don’t even need men. She does not work alone. She works with Nathan Drake to overcome the odds.