CorvusCorax
Deary me...
Really??
No wonder she's unhappy.
A lot of dogs don't like ambiguity and do not like to be in roles of responsibility/leadership but sometimes our behaviour/body language makes them feel forced into these roles. A bit like humans, I've never gone for promotion because I know I'm not a very good (wo)man manager, it freaks me out having to organise other people as well as myself, I prefer to stay in the background and do the donkey work.
The OP might THINK she is teaching this dog to be 'bottom of the pile' - but might not actually be doing this for a number of different reasons.
Having said that - I typed out a few replies to the OP on Saturday night and deleted them as they were a tad long-winded and techical - if you really want to work this out, it could be that you will have to change your whole demeanour, your voice, your actions, your behaviour, to make this work, and even then, her associations with your past behaviours might be too strong. If you can't or don't think you can commit to this, then I would still consider rehoming her.