Ideas:
"Breast milk"/"Human milk" = Dialog along the lines of her recognising it as milk, but it having this extra sweetness to it.
"Black hole" = Black hole forms in her stomach, ripping her apart from the inside out.
"Old" = Makes her an old person
"Young" = Makes her young
"Baby" = Turns her into a baby, with dialog of babbling.
"Sadness" = Makes her sad, use it 5 times and she cries.
"Naked"/"Nude"/Synonym of naked = Removes clothing, added with dialog of her being embarrassed, the screen goes black as she appears running away, before returning with a change of clothes, annoyed.
"Smart" = She gets glasses, and speaks in Shakespearean-like English.
"Dumb" = She drools, while speaking dumb like "Me feel weird, brain feel funny" or something like that.
"Vomit"/"Puke"/Synonym of vomit = Makes her as sickened as drinking shit, but with different dialog like "Whatever you made me drink, tastes like vomit- wait, was that it!? DID YOU MAKE ME DRINK VOMIT!?".
And any (coz I can't find any) cups that affect the player.