I really wonder about a few things I saw in this weekend's final episode

1) Where is the original Clara: is that the one in 'modern times' playing governess to the two pre-teens? Or is that also a copy?

2) All the Clara's we see: is it implied that she is 'inside' various Companions of the past? That she has imprinted herself onto Ace, or Sarah Jane, or Jo Grant, etc? The outfits seem to mimic those of various female Companions he has had... perhaps that's why she is there but he never 'notices' her?