Platinum that has gone gray

I am trying to go platinum and I just switched stylists because my friend was doing my hair and she left it too yellow. So the new girl that has been doing my hair said it is normal for platinums to go through a gray stage. My hair is gray in some spots and underneath my hair it is getting dark gray. She guarantees me it will wash out as the toner washes out but I'm nervous that what she is saying isn't true. She says that toning it can make it gray. Please help.

im not a pro but i have heard of greyness through toners my toner leaves my hair with a purple tinge, ive also had a muggy tinge on my hair!!  crazy  the things we doo!!!! but when i was platinum my hair was that over processed in areas the colour went grey almost transparant so just keep a check  

when i first got my hair bleached it was grayish/greenish as well. the problem was that my stylist used an ashy toner, and that freshly bleached hair really grabs onto the ash colors. next time tell her you'd like to go with a blue-violet or violet toner - these will cancel out the yellow without making the hair gray, as long as they're not on for too long.

but yes, the gray will fade!