^^ I am a brunette with olive complexion warm/yellow toned and have no problems wearing blue based colors.
She is probably best going to try on a bunch of things. At least she will have a few ideas to take with her
I think that whether or not you need a liner is going to depend on a few things (besides personal preference, of course):Do all of these have to be worn with a liner or is there any brand that goes on really well so you don't need one? I have not bought dark lipstick in 4 years can you tell??