Its ok. She was like only 3-4 months old. She was so weak
This is where I disagree with you. It wasn't OK. She was just a baby and didn't have a chance at life.
A sick bird should be taken to an avian veterinarian!
Since we don't know what was wrong with her, we don't know if she might have been saved, but there is a good chance she would still be alive if she had been given that chance.