Unfair wage increase

A little background:
In our facility we have a unit manager for CICU, MED, SURG, OR, ED, OB.
The OB dept has been without a manager for almost 1 year. One came and left within 2 weeks. The ED manager has been doing almost all the OB coverage aside from about 3 months when the rest of us took turns.She appeared to want to so none of us fought her for it. Besides we all thought administration was still attempting to hire for a manager. Boy were we stupid!! Keep in mind none of us have including the ED manager have any OB experience except one who years ago worked a short stint in OB as staff. All of the Unit managers in Nursing have been paid the same wage up till now. Two of the managers, myself included, were informed this week by our CNE in a informal conversation that the ED manager was going to take the OB dept as manager along with the ED. The reason for my post is to help get my anger worked off and to seek out other thoughts on this outrageous action The clincher for my anger is that she will be getting a 15 % increase in her hourly wage which amts to 5.00 hour increase to oversee a dept of 12 employees with aprox. 15 to 20 births a month if they are lucky. On top of this none of the other managers were privy to this until after it happen and none of us were given an opportunity to be considered for the position.
This manager has only been a manager for 2 years, does not have a BSN she does smooze good and knows how to play people esp administration. Supper big brown noser.
Two of us ask this manager how this was decided and she said she gave administration an ultimatium and said she would'nt cover the dept anymore unless she was compensated. She had the gull to tell us she orginally ask for a wage of 1 1/2 time her wage which would have given her $24.50 more an hour. now mind you 3 of the other managers have a BSN, all have over 5 years management experience with one of these with 12 years management. All but one has covered the OB dept when there was no one to do it. Anyone of these other managers could do the job.
Two of us confronted our Cne and were told if we want the job then "toss your hat in the ring" yeah the job has already been given. So I did. I informed the CNE I was now interested in t managing the Dept along with my own which will give me over 50 people to manage to her 30 to 35.I am so upset about this I want to spill my guts to the other managers/dept heads in the facility as I know the roof would be raised of .We had a FOIA exposure of all the management/administration salaries/wages in the local paper about 3 months ago and it caused a quite a stir as it was obvious wage/salaries were not fair. Now this unit manager will be the 4th highest paid manager out of 26 managers. Our lab director, radiology dept will be paid less then this manager and both have three times more responsability and there are others. I would appreciate your thoughts and input and what would you do?I was told by Cne that it would be July before she would consider my application for position as they are waiting for salary surveys to be finalized. Hmmm the manager for OB/ED had her wage survey as we were told this is how they determined what she should be paid based on her job description . I compared the job description and there was no difference except the manager of OB needs to obtain NRP and STABLE within one year. In fact the sentence that states all the nsg. managers have 24 accountability is removed from hers. She doesn't believe she should be accountable after she leaves work for the week-end or after she leaves during the week. Once we get our survey back and hopefully get a raise Hmm does she get another pay increase when all the other managers/ dept heads get one. What do you think about this situation?