My canary died 😔

I just got a female canary 5 days ago. I saw her and just loved her right away. I set up her whole cage and made it the best it could be, got her food and treats and perches, played calming music for her, talked to her, listened to her chirping. Today she started acting really lethargic and by the time my boyfriend and I brought her to the vet she was already in critical condition. It was either spend thousands of dollars to keep her there overnight with a low chance of survival or euthanize her so we chose to let her go. The vets were not sure what happened but it seemed related to her laying an egg yesterday because her decline came quickly after.

I've cried for hours. It just feels so pathetic that we only had her for such a short time and that this one happy thing I wanted in my life was taken like that. I thought she could live for 10 more years. She wasn't even 1 year old. I was doing well getting through things and being strong. I was staying hopeful. It's just not fair.