Parakeet Died Today?

My sister has 2 parakeets, one green and the other Blue &White...the Blue and white one was a female, Don't know how to say this but she died today, don't know why, but her butt/anal was big, it happened like 5 days ago, she looked like she was gonna let out an egg but some red and white thing came out but... show more My sister has 2 parakeets, one green and the other Blue &White...the Blue and white one was a female, Don't know how to say this but she died today, don't know why, but her butt/anal was big, it happened like 5 days ago, she looked like she was gonna let out an egg but some red and white thing came out but went back in, since then her anal was kinda big..lately she was just sitting there like she sleeping with her head tucked under her wing, but awhile ago she died and now the green one is just chirping away in other room...I wanted to know if anybody knows what might have happened to her?...thanx to all who answer...
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