Hello! So this is going to be rather vague. I believe this was a manhwa, with a female protagonist. I think MC was liked by the Queen/Empress (or used as a pawn) and she was asked to befriend the blind princess. Said princess who might have turned into an antagonist later. I have no other details to share because I legit only remember this scene. Thank you for your help!
Is it I Belong to House Castiello? The antagonist Princess Iris was/is (?) blind. Spoiler The Queen was obsessed with the female protagonist's father and was thus, obsessed with MC. I felt bad for Iris because her mother actually disliked her and liked MC more. Princess Iris was later cured of her blindness (?) and got engaged with the ML and formed a faction against the female protagonist.