There are options if you are unable to use said toners/dyes due to ingredients.
Direct dyes, though technically semi permanent can cover very well and last a long time, many are allergy safe and no developer required.
I had grey hair for several years, which I achieved by using a good quality bleach + silver shampoo and Pravana Chromasilk Vivids Silver dye.
I use these types of dyes as I am on long term chemotherapy and only do one process to preserve my hair integrity etc etc.
My hair is very dark with red undertones so can be particularly difficult to lift evenly ( I do it myself, #expertcolourist
) but the results are good even if my base isn't completely even.
You can easily vary the intensity with conditioner or mix in small amounts of other shades to neutralise particular areas for better tone overall.
The picture was taken about three weeks after dyeing so the more orange areas are more obvious, but they are just neutral/less vibrant, not brassy and strange still.
This was also six years ago, so there's way more to choose from and excellent tutorials nowadays.
It's a shame Sali had such an awful reaction before but it's so easy to avoid PPD etc if you need to, so maybe just get a fucking grip and work around it?
I don't personally use social media to speak directly with people I follow but do not know, but I really feel sad for those that do engage with her posts to be spoken to like that. It's pretty disingenuous to invite interaction in a private group in this way if you're going to be so nasty about it.
I imagine it must make those singled out feel quite upset.