Wow, she's not bad. I don't know any female Link mains.....actually I'm the only Link main I know.
She needs to take advantage of the openings. I saw SEVERAL instances when she could have smacked him with a strong attack but she shielded or rolled instead. Actually, she rolls and stays defensive way too much. Link has one of the best dodges in the game, but his roll is not great, so she shouldn't roll too much.
Tell her to ramp up her projectile game and use more n-air though. And try not to even ATTEMPT an f-smash unless they are at a reasonable % (it should be saved to KO, unless there's another method), also, she shouldn't throw out laggy moves like up+B, d-air, and f-smash unless she thinks it will connect. Don't use those attacks to 'anticipate' opponents because if they miss....well there will be some pain. Just use projectiles and quick attacks like u-tilt, u-smash, jab cancels, and AIMED z-air to rack up damage. Also, stop missing grabs lolol
(Maybe she should airdodge into z-air after a shorthop to hit a bit lower. She misses z-air too much)
D-smash should also be used a little more often. It's somewhat quick and can catch rollers. And it can KO.