determines

dɪˈtəːmɪn

verb

cause (something) to occur in a particular way or to have a particular nature.

it will be her mental attitude that determines her future

control,decide,regulate,direct,rule,dictate,govern,condition,form,shape,affect,have an effect on,influence,exert influence on,sway,act on,work on,mould,modify,alter,touch,have an impact on,impact on,prompt,impel,induce,lead,move,cause,motivate,stimulate,prod,spur on,provoke,incite,dispose,incline,persuade,encourage,urge,inspire,make,deciding,decisive,conclusive,final,settling,definitive,key,pivotal,crucial,critical,most influential,significant,major,chief,principal,prime,paramount