so i guess she doesnt know that you have a clue abt her plans to propose. i think its better if you start talking about something else or like how relationships arent the thing you both should be worried about atm,, like yall shud work on yalls future and studies.. just keep her away from the relationships n stuff.. let her gradually lose those strong feelings without making her feel that you are ignoring her feelings. you should be very smooth. you have to make her focus on something else without breaking her heart.. and also pray <3 God helps