Who is Tasha Ozera from Frostbite and what is their importance?

Tasha Ozera is Christian's aunt. When Christian's parents became Strigoi and returned for Christian, Tasha managed to hold them off until the guardians arrived. Afterward Tasha realized how vulnerable she was so she began searching for ways to protect herself. Also as a result of the Moroi society's opinions about the actions of Tasha's brother and sister-in-law, Tasha has integrated herself into human society. It is Tasha who tells the Moroi at a meeting regarding attacks by large groups of Strigoi that the Moroi should learn to protect themselves independent of the guardians.