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It sounds to me like you were having remorse about the situation yesterday and feeling uncomfortable being yelled at while trying to do a good job. Then you finally sleep and try to relax and the mind keeps going....the dream sounds like you were reworking the whole event to apologize for it. sounds like you have been worrying about your supervisors reaction so her telling you in the dream that it was okay is giving you the reassurance you need to let it all go and just move forward from the situation and maybe even learn a new way to handle things within these relationships moving forward.
It all sounds like it will be okay.