@Philosophus Vagus you can steal the idea, I wouldn't mind. ^^
The main reason I thought she would be dual wielding scythes is because claws are mainly dual wield, but the character can either dual wield or it can not, I could not even make a weapon like Ritual Dagger (Athame) because the Witch already can use that weapon.
Each of my characters have 2 different weapon types, each doing different things for example the Vampress having claws to apply statuses with her physical attacks and such she needs to get close and personal when draining life, sucking blood with wounding people is more effective than calling the blood slowly so the claws will provide additional utility when doing so, and scythes apply pure magic damage. For other characters it is different for example for the Ranger she can prefer bows for speed or crossbows for higher critical chance.
I think I will include Dual Wield aspect on the Claw weapon itself, and if you use a Scythe, you can use your offhand slot, the skulls. The skull is not really that important but skulls of powerful enemies can be used as a locus and I think a blood mage would appreciate that.
I am thinking the claw weapon not fitting the character though so I may quite likely change it to make her a full deathbringer. I never designed the character to actually rely on close combat.
What you picture in your mind about her fighting style is correct though, her battle style is like this. Considering she approaches when she has health, she will first use her blood to throw a volley of blood at you, attempting to wound you and building her might. When she is fired up, she automatically lets her dark instincts take over, embracing her true form with enlarged wings and skin pale white. She then proceeds to get close and personal, harvesting the blood from your wounds while you get captivated by fear.
But I must admit a storm of scythes coming at people would also be awesome. It is just that you are supposed to get Death Sickle and other thematically important scythes and they are meant to support magic.