its a feature that actually hasn't been added yet, if you click the "id card" on the top menu and find her name click it to view her bio then at the bottom left there a line with a dot on it brings up the "routes/sex" page but clicking route doesn't do anything
and outside of a few scenes in week 1 with her the "route" makes no difference its never mentioned agian (maybe in long way in the future it will) but it doesn't now theres no flags for routes in week 2 or 3 (I've been through all days scripts) only flag that comes up for her during her scenes is the the one for the nickname (when you tell her what to call you)
but if you want to change it to future proof yourself
Open consoles and type (enter one at a time)
For love route
For corruption