Hi got a new client coming in for colour...it’s short and atm quite bright purple. She is naturally about base 6 with about 20% grey. She says previous salon used revlon colour and then colour ball after. I use Wella and would normally bleach or highlight it first to get it bright but she says she only has it highlighted now and again and just wants a colour this time. I’m thinking 55/66 but worrying about it being to dark and not bright enough. Would it work if I mixed it with a little 10/0 to lighten it slightly and 0/66? Thanks in advance