Chick is doing great! What else should I do for her (him)?

[Moochie]

I have a high feeling she'll pull through. There's some kind of thin teeny membrane connecting the yolk sac to this hole under her vent. I told my mom not to put her back with mama until that is gone, because mama could peck at that and pull out all the intestines. Scary thoughts :O
Her fluff is getting fluffy, I'm keeping her in a box with a slightly dampen towel to keep the humidity and my bed is heated. So she'll be sleeping with me tonight! She tries to get up and walk around but she drags the teeny yolk around.. And doing that makes the membranes 'round the yolk bleed at times. It's a very small yolk by the way, it's the size of a pea and the membrane connecting it to the chick is like thin string size. No pulling whatsoever, it causes the chick pain and she peeps madly when she accidently tugs on it. So my questions are...

When will this membrane and yolk fall off and the hole seal up?
How much longer should I keep her with me?
Will she blend in with her 4 siblings or will mama reject her? Grey One is a pretty chill mom, she lets me touch both her and the babies.. I'm sure she'll accept this one..
And what else should I do for it, other than what I'm doing now?

 

[Egghead Jr]

I would just hold off for a while and see if it falls off...it can't hurt anything...and as far as reuniting it with the others...it depends on if the mom will take care of it...at times i have seen moms separated from chicks reject them later on but that's fairly rare...just give it time to regain its strength and heal completely...hope the best of luck to you and im glad everything turned out alright