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I suppose you mean Akroma Angel of Wrath and yes you need to sacrifice her simply because she is not the target of Call to the Grave. Call to the grave targets players and these players have to sacrifice a creature. It's the player choosing the creature he sacrifices so protection rules don't apply.

here are the rules for protection

The abilities of protection are best summed up with the acronym D.E.B.T.

D For creatures with protection, all Damage that would be dealt to it from sources of that quality is prevented. For example, if a creature has protection from black, black creatures can't deal any damage to it, nor can any other black cards deal damage to it.

E The card cannot be Enchanted or Equipped by cards of that quality. Again, a creature protected from black cannot be enchanted by black enchantments or black equipment. If a creature gains protection from the quality after it has already been enchanted/equipped by that source, the attached cards will detach and go where the rules would normally force them to go in that circumstance. For this reason, white enchantments that grant protection from any color tend to state that their effects cannot remove themselves should you name white (or the enchantment's color is changed to whatever you named).

B Creatures of the stated quality cannot Block the protected creature. So, a creature with protection from artifacts could not be blocked by artifact creatures. This does not prevent the protected creature from blocking those creatures, but they cannot block it. For example, White Knight cannot be blocked by black creatures, but it's still free to block other black creatures when they attack you.

T The creature can't be Targeted by sources of the named quality. For example, Putrefy could not target something protected by black, green, instants, or whatever other qualities it happens to meet. This applies even if the creature didn't originally have protection, but gained it before the spell/effect resolved. If you tried to play Putrefy on an otherwise normal creature, and Bathe in Light was played in response to name green, the Putrefy would fizzle on resolution because its target is no longer legal. Keep in mind that this only applies for targeted spells/effects, which means it has to say "target" on it. If it doesn't target anything but just affects it, protection does nothing. Wrath of God is a common example of something that could get through "Protection from white", for example.