I found out that my grandma might have 1 year left to live and honestly i dont care am i a bad person?

like serously my gandma had cancer and she made it but now it came back and she just keeps getting sicker and sicker and today she had a doctors appoinment and thats when she found out my mom told me and i was like ok and i smiled a little and my mom was like u think thats funny and i said NO but i dont know what is wrong with me im not in shock or denial or anything i feel like crying not because she might pass away but that i dont care while everyone in my family is crying annd everything what is wrong with me im a girl and im 14 i see my grandma everyday so we are close can u PLEASE HELP!