My daughter expecting 160 marks in JEE advanced 2017 and we belong to Gen category. What rank she might get and will she get into IIT?

Happily.  If the marks is really around 160, then there should be no problem about rank and admission in some IIT.

dear mam 
its quite difficult to get with this score , as this year paper was quite easy than last year , then the cutoff for general will go around 190-200 , so, with that marks she can only get some descent branch in lower iit . 
consider mains score and if possioble join into any nit or iiit . 
else , if she filled for bitsat , then go with that 
regards