Dear Jennifer,
I too lost my mom in death at an early age. I have found comfort in reading the Bible's promise at John 5:28,29 that all those in the grave will hear Jehovah God's voice and come out, just as we read about the many resurrection recorded in the Bible. Until we see our beloved mothers again, it is helpful to "search for Jehovah and his strength" (Psalm 105:4,5) He will give us the strength to endure.