I think it was also an effect of Her's control, though, too. Now that Her's control is gone, Minnie is back to her original form. All the costume changes she went through were due to Her's influence and Her control over Minnie's emotions
Let's just say she is in her "naked" soul form. So it might be metaphorical that her clothes show her actual emotional state. After all, when you look at somebody's soul, you should be able to see all through them, so their emotions should be exposed, if going by popular metaphors. Hence, Minnie cannot hide her dominant feelings (whether they are hers or given by Her) and so they display as a change in her garment.
This is not to say Her was actually responsible for the clothes changing, but that's one explanation. This could have all been an illusion, Minnie could have been wearing the gown the whole time, and Junior only saw the green outfit and Mandy's dress because that's what Her wanted him to see.
This is a bit risky to assume. From forcing fake reality on someone the way to forcing control is not that long. I think if Her was able to make Jr see things as she wanted, she would also have been able to take the control over him, which she didn't do.
The only thing to determine is whether those clothing changes were only thanks to Her, or were they just normal for a soul undergoing different emotional states. Either way, I think this is unimportant, seeing as Minnie never loses the control over her hidden desires on her own (yet again assuming she has those), so she shouldn't change from her form now unless she loses it again. The only possible change would be similar to her nergal transformation when she tried to protect her brother. But she is unlikely to have those powers at this point, so this change is also unlikely.
I thought you were not going so delicate around here, nor will I have to speak to speak their own language so that they understand
I don't really care, since I understand you whether you use one or the other. But not everybody here can speak languages different than English, so using English all the time is simply the display of being polite towards others around, don't you think?