Rubber eggs and blood coming from bum

[Ettore.fin]

There's a bad smell from her laying area, and she's weak. Still eating and drinking though. Have a look at the pics tell me if it's serious

 

[Eggcessive]

It looks like she has suffered a prolapsed vent, and the other’s may possibly have pecked at the red tissue. Try a shallow soak in some warm soapy water to clean off her vent area. Dry her off, and take another picture. Lubricate her vent with some honey or veg oil, and try to push the prolapse back inside. If it goes in, hold it there for awhile and hold her to get her to relax. You can us a little hydrocortisone cream on it as well, and just keep it from drying out. Drying out can cause the tissue to turn black and die. Make sure that she doesn’t have a stuck egg inside, and that she is passing droppings normally. Here is some reading:
http://www.the-chicken-chick.com/prolapse-vent-causes-treatment-graphic/

 

[EggSighted4Life]

Guarantee it's serious!

How old is she? Is that a prolapse? What do her droppings look like?

If by rubber egg you are describing a lash egg..
http://www.the-chicken-chick.com/salpingitis-lash-eggs-in-backyard/

Prognosis is poor.

Other possibility is vent gleet...

Hope she recovers or you get answers soon.