I am a fairly new Christian.  I attend church regulary and bible studies.  I was rasied sort of Morman, I mean that because my parents weren't active, but my mom still holds on to some of their beliefs.  I am trying to bring her to what the bible teaches.  She made a statement the other day that I couldn't back up yet.  She said that she believes we pre-existed in heaven as spirits before being born.  Can someone please help me with this?  
thank you so much.  
I am struggling with having the right answers to her questions at the times she asks me.