J.M.
Ok so I'm a BIG fan of the Supper Nanny so I really believe that her techniques work if used properly. The thing with the supper nanny bed time routine is that after the first time she attempts to get out of bed you are nice and tell her "its bed time sweetie" the second time you are stern and tell her "its bed time" the third and subsequent times she gets out of bed you don't say anything to her. So that means that you do not respond to any requests she makes like water, or toys or door open more. You strictly do not give her any attention except for walking her back to her bed. Yes it will take a night or two but she will get the point. As for keeping up her little sis, maybe you could put her to bed in another room for a few nights while you practice the routine with the other one or maybe put her to bed after you get the oldest settled in. The supper nanny thing will work but you have to refuse to give her attention when she is suppose to be in bed and keep at it until she gives up, you can't give up first. Also, it may take two or three nights for your daughter to realize that you are serious about her staying in her bed. Keep trying and good luck!