That Sindoor Dhan ceremony was the perfect symbolism of Gayatri's condition post marriage. Everyone around thinks Ranaji has filled Gayatri's maang. But she and Ranaji knows the truth. The maang was not filled with Sindoor.
Similarly she has become Rani Gayatri Devi in front of the world. All the rights the rani should have she is expected to have as far as the society goes.
But then she is a woman actually having no rights. That picture of Gayatri with maang filled is a picture created to please the world by Rajmata. The great illusion. Ranaji has not created it. It is for Gayatri to walk that path and create that picture.
When Ranaji will truly welcome her as Rani Gayatri Devi. Actually both Ranaji and Gayatri at this time are puppets in the hands of others, who have decided their destiny.
To carve out their destiny they have to break the shackles that bind them, and first one to do that will be Gayatri only. As in sat epi where she goes around trying to find the killer and her maang is getting filled by Ranaji's blood.
So it's a sure shot symbolism that she will play on her life once again to save him from a most critical condition and only from there she will be become the real Queen of Ameerkot.