I don't know what to do??

My canary recently got sick, and I was so scared, but my sister told me not to worry about it. After that, I took the canary out of her cage and fed her, even though she wouldn't eat a single thing except for the shell of a hard-boiled egg. She was fluffed up and could barely hop and even fell to the ground. I put a napkin on top of her cage and she was breathing really hard until I realized she laid an egg! My sister told me,"See, I told you there was nothing to worry about the only thing she was sick for was because she laid an egg," So I didn't worry, until I saw her still really sick, now she's in my room with a black shirt over her cage fresh food and water, which she won't ea, and is sleeping, what to do???!!!!!