I've never done this but I'll give it a stab...lol.
First, I think I would remove the color from the areas that being highlighted with colorfix. Once you get the black out, then I'd bleach the hair, if you need to, to two shades lighter than the black.
Then tone it with a Medium neutral brown, if you want more red then you could add a bit at the medium brown level--does that make sense? See the link below:
I think she wants to keep the black, but add highlights.I'd try the burgundy highlights.That would look cool.I would either ask a stylist on what to do,or I'd get them to do it.
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