Taliyah needs some innate tankyness imo.

She' reminds me of Sols playstyle, low range zone control mage.

But Sol has 2 strong cc's with more reliability and is even stronger with rylais, and taliyah has a wimpy low range slow with a difficult knock-back+up.
I don't think Taliyah needs anymore CC but I think implementing some damage reduction would be an improvement.

I can think of a few ways to do it:

-Worked ground provides 15% damage reduction or tenacity

-Threaded volley reduces damage taken by 5% on first enemy hit, and 2.5% per subsequent hits, up to 15% for 3 seconds.

-Passive could generate stacks of damage reduction up to 15% that last 5 seconds after Rock Surf ends