i think koki will most likely choose gopi over ahem. i mean just because ahem is her son doesnt really mean much. thruoghout this show koki has come to love gopi and treat her as a daughter. she is an understanding women who cares about the safety of her children. koki will soon find out what ahem is upto nd she knows that what he is doing is wrong. i think that even though koki does not really beleive in love, she knows what is right and wrong.
dont forget guys that when gopi was lost in switzerland koki was the one freaking out nd when she was found then koki took her into her arms like a mother. koki is the one who blasted ahem for treating gopi wrong nd to punish her nd not punish gopi. she is the one who made ahem realize gopi's true beauty. she is the one who gopi looked up to when in trouble. she is the one who brought the teacher to gopi. nd when gopi found the golden murti of kanaji, koki was the one once again who took her into her arms and protected her. she is the one who is always trying to make gopi understand that rashi is not doing any good for her.
if it wasnt for koki than gopi's birthday wud never have been celebrated so nicely nd when gopi fed the cake to koki then koki told her how pround she is to have her as a DIL and as a daughter. she is the only one who knows gopi is strong inside but it will take some time to bring the strength in her gopi vau to come out. Like a mother, koki protects gopi as much as she can and worries about her alot.