Hair dye

I wanted to go blonde but I had dyed my hair black with the box like 3 months ago so I couldn’t go too light. She did 3 treatments today n this was the end result.

I wanted this

She said to buy a purple shampoo do y’all recommend any brands and Also do I put it all on my hair or just certain parts. N do y’all think I’ll be able to go lighter soon.? Thanks