Grey blending

I have a client coming in wanting what she called "grey blending." I've cut her hair once and we've already done a consultation for the service and I did a test strand on her hair. she has been coloring her hair medium brown professionally but is fully grey and is tired of seeing her roots coming in and ultimately wants to go fully grey. her color is definitely a lighter grey but not white, and she has very little "pepper." the option we discussed was essentially a platinum card to remove as much permanent color as possible and then tone from there. the rest strand got pretty light, maybe an 8 or 9 from just sitting with no heat. she is aware that is will take multiple sessions to get it light enough to match her natural grey and that the previously colored hair will require maintenance until it grows out and is cut off. I've only been doing hair for a few years and have never done anything like this before, and I started in an Ulta salon about 6 months ago so I'm still kind of new to the Redken line.

for reference, our salon uses L'Oreal INOA, Redken Color Fusion, and Redken High Lift for permanent color, Shades EQ (liquid and we have some of the cream ones) for demi, and the lighteners we carry are Flash Lift and Wella powder lighteners, Wella clay lightener, and Redken Blonde Icing for cream lightener.

how would you tackle this project? would you use a different approach? one stylist suggested potentially adding lowlights after lightening to blend a little more in the meantime but I feel like that might just make it harder in the long run for future lightening, especially since she doesn't really have any natural lowlights

and if you are in an Ulta Salon, how would you charge for this service? we don't have an option for a platinum card service. I currently have it booked and quoted her for a color transformation but it was difficult for me to estimate how long the service would take and thus difficult to get an accurate quote, especially since I'm a bit of a slow worker and new to this type of service

any suggestions or advice would be greatly appreciated. thank you!