Good evening, Zinora!
I regret to say this but I worry there might be too many difficulties too have Zinora join into the guild.
"She is cruel, stubborn and evil. she doesn't like mages and undead." This makes it rather impossible to be in Sang Real as the duty is to protect Quel'Thalas and it's people, not a task for one of evil - not to mention Sang Real has both mages and Death Knights around that are treated with just as much respect as anyone else.
There is also the slight problem of the combination of a 'Warlock' and a 'High Elf', seeing how Warlocks uses fel magic and this fel would turn her into a blood elf.
I am sorry to say that your character might not be fitting into Sang Real, but if you ever decide to make any changes, I'm more than happy to see a 2nd post.
Best of luck out there!