Help with ash grey toner

[Elvie2002]

I have a client tomorrow and wants her hair like the picture attached but not sure what toner is would be the best . As I will be doing balayage first then toner? So maybe like a Ashley Fred but need more opinions from you guys

 

[michalaurenty]

I would use wella Koleston 10/81 or color touch 7/89 but just for couple of minutes. Both with 1,9% developer