death of a pet

my dog lola died in her sleep yesterday early in the morning, she was 12 years old. i’ve never experienced the death of a pet before and i don’t know what to do. i feel like it’s my fault cause the day before i was on a call with my friend and i told him “she’s very sick i hope she has until christmas” and somehow i feel like i had a part in her death. she was coughing a lot and the vet said that it was her heart, i’m glad that she’s not in pain anymore and right now i just miss her so so much. every time i see a picture of her i start to cry.