She obviously doesn't care about us.

Literal

She [topic-は] clearly us [possessive-の] thing [object-を] is-not-minding.

明らかに私達のことを気にかけてない — 気にかける (きにかける, 'to care about, be concerned about') in negative. のこと ('matters of') softens the reference. てない is the casual contraction of ていない.