Any advice on what 2 build or play vs her?

nothing u build will help if u walk into cc

It is hard 2 avoid it because it traverses through minions and her ult range is huge

Tenacity will help. Move speed will help. QSS will help. Mercurial Scimitar will help.

@OP
There are a few things you can do.
-What are your masteries? Putting a chunk of points into the defense tree will reduce the CC effects.

-Time it out. If shes just used her skill, you can play more freely knowing its on CD

-Boots? Tenacity will help you quite a bit,

-Champion pick? Some champions have abilities that prevent CC from being an issue. Morgana has Black Shield, Alistars Ultimate removes all CC. Poppys Ultimate makes her untargetable etc.

-Role? Many support champions, while not being able to remove CC can still protect themselves or the ADC from taking damage by casting a barrier. Janna's and Nami's barriers both add damage as well so if Zyra hits you with her CC and they come into range to attack, you'll be able to reduce damage taken, and deal a surprising amount back.

-Call for help! If Zyra has blue buff and is spaming her spells like a mad man call your jungler over to help. Once he shows up shell either run away, or stay and fight. If she fights your team will have the numbers advantage and you can often steal her buff and if she runs away your lane can farm for a bit without worry.

I hope this has helped, goodluck!