Things can be done to help this dog accept his position as less than Alpha but a very large rethink is needed. To change your whole outlook on an issue such as training and behaviour is a mammoth task and your friend needs to be realisitic when deciding if she is the woman for the job. It is very important for her to understand that this will be a long haul job and will take vast amounts of time and effort. She may have to behave in a way that goes against her instincts on how to deal with this dog and that is a lot tougher than it sounds.

First off, if nothing else, please urge her not to try and roll this animal ever again - this is a very dangerous thing to do unless you are 110% sure that your assesment of the animal and his own feeling of status are correct. The tiniest mistake and you are in big trouble - if the dog believes that he is your superior he will react as such. A physical challenge from a lower ranking animal deserves an aggressive and physical rebuke such as your friend got - she was, indeed, lucky. This dog is no where near able to accept her as leader and physically challenging him is an unsafe and unsound action. (For the record - I have never rolled a dog to gain dominance, it is far too dangerous!) Please impress this on her.

The second thing that I would advise is to stop treating the other dog as a higher ranking dog than the newcomer - there are two reasons for this. The first is that until the new dog sees her as the Alpha he won't care what she thinks the pack hierachy should be and her attempts will mean nothing to him. The second is that the dogs both need to understand that your friend is the Alpha - no questions, no challenges and no contest - it is then up to the dogs to work out where they stand with each other. I think the newcomer is a much more dominant dog than she is used to and he will easily dominate her bitch - this is fine and nothing to worry about. Once she has established herself as Alpha with both dogs it will cause tension and stress if she continues to treat the lower ranking animal as she is at the moment

Another problem she is facing is the breed. They are fantastic dogs and loads of fun if handled well but they are manic! To get the best out of a chocolate takes experience at the best of times - one major plus is that most of them are willing to do just about anything for a titbit.

For now I would advise seperating the dogs if they are left alone, keeping a lead on the newcomer when your friend is at home and using that - not a hand on his collar - to remove him from furniture etc. Do this without looking or talking to him. The idea is that you can be calm, quiet, not make a fuss and still have what you want happen - this is very impressive to a dog!! If this means sitting with him on a lead to prevent him getting up to mischief - then so be it. The key is to ignore him at all times (this can be straining in the extreme - I once had a chocolate jump up and down on the spot, right in front of me for nearly an hour and a half - not at all easy to pretend it isn't there and that you haven't even noticed it!) The dog will, at some point, give up trying to do what it is doing - it may well try climbing on to your friend, barking, staring straight at her, pulling on the lead and a host of other things. The point when the dog lies down in a relaxed way (not looking at your friend, but with his head down) is the point where your friend should start timing. If the dog gets up and tries again - go back to the begining. 5 minutes must pass before she acknowledges the dog in any way. A quiet "Good Boy", will be enough - this will become easier as time goes by but it is an excellent way of calming and dominating any dog and is the basic method behind everything I do. If you can crack this one - you have it made.

Sorry this is so long - we have only touched the surface and this is much harder than it sounds. If your friend decides that this is not the dog for her no one could blame her - it is possible to change things but it will take huge effort and time.
Please let me know what she decides to do - a very difficult decision. If I can help in any way please let me know