Xayah relies heavily on her ability in order to proc a snare with her feathers. Without it, she can't follow up on the engage from her Support. Try to play around her cooldown which is 10 seconds at rank 1.
Stay in the same side of the lane as Xayah, so she can't line up her feathers through her basic attacks that are thrown at minions. You may think the damage is insignificant, but after many hits- it starts to make a difference.
Her is her main source of DPS and has a 20 sec cooldown at rank 1. Try to bait it out and fight her afterwards.
She struggles in fights where she gets flanked by multiple members because she cannot line up the feathers she throws. Try to flank or at least keep moving sideways while fighting so she cannot stack feathers behind you.
Xayah will use her when she is in immediate danger. Wait for her to Ult and then burst her down afterwards- but be careful with her feathers after her Ult.
She is immobile, so slows can be really effective against her. She also has a low basic attack range, so try to kite her around the slows, while minimizing her chance to escape or fight back.
1. Once she hits level 3, she unlocks every ability and this is extra strong power spike for her because her abilities work better when you have all of them available. Do not play overly aggressive as she might just turn the skirmish around and kill you.
2. When she gets 2 items (Essence Reaver + a Zeal item or Infinity Edge + Zeal item) she gets inherently strong since she will have 50% crit chance and a decent amount of attack speed, which means her feathers do more damage and are faster to place. Always keep your wits about you and look out for stray feathers.
3. At level 13, she’ll have her and maxed, which gives her a lot of attack speed and a a lot of feather damage. Do not run directly towards Xayah as she will be able to throw feathers, cast her and lock you down. Attack her from the side and in a surprising manner to shut her down.