Robbie, you're on the money! Keep doing whatever you are doing.
The frame that you enlarged is extremely well done. The only thing possible is for minuscule improvements; if that.
The colour of her nails, colour of her rings various and colour of her skin is spot on. Bearing in mind I am looking on an uncalibrated little laptop, but it is very well done.
The only changes I would be thinking of doing, are density differences. The cream coloured top is a bit light looking, but one can certain;ly live with that. If you printed it with a bit more density, say 1/8 to 1/4 of a stop more density (darker), then watching her face to ensure you don't darken it too much. You may find that the wonderful highlights on her face may just enhance the whole image slightly more.
The contact sheet tells me that you didn't change your exposure between frames in both situations, the group with the trees are obviously more dense negatives, but are all the same density, same as for the red roller door group. Doing camera exposures like that will make your job in the darkroom easier as once you have dialled in one frame in a series, you can use your contact sheet for density reference in the darkroom for the minor adjustments in a group of frames.
Magenta and green are dialled in via the magenta filter, yellow and blue are dialled in via the yellow filter, Cyan and Red are dialled in via exposure. That is how you control very fine colour negative printing.
With regard to cyan and red, if you make your perfect colour print darker, then it will start to go reddish, if you pull the time and make it lighter, then the print will go cyanish. The effects are often not noticeable, but if you start out with this knowledge in your (presumably) overworked brain; it may help.