Lady Stark?

Lyanna?

Lyanna?

Flashback scenes of Lyanna Stark.

I love her but she's a bit old to play Lyanna, surely?

Never say "Worst movie ever" to someone who's seen Highlander 2

I was thinking Lady Stoneheart. The current photo of her looks eerily like Michelle Fairley, although she is several years younger. Put enough corpse makeup on her, and few will know the difference. The character doesn't really talk, so the difference in voices won't be much of a factor.