Both characters require a voice actor who can perform both the adult and the mid-teen versions of the role.
The voice should feel like the same person at two different ages, so I'm looking for actors who can adjust their pitch and energy slightly to create a younger version while keeping the same overall tone and personality. 

(Late-20s to early-30s)

A calm, gentle, introspective woman with a soft emotional undercurrent. For the first half of the film, she should sound slightly dazed or distant, as if drifting. Her voice doesn’t reveal all her emotions, it feels held back, subdued. When she finally rediscovers her reason to return to reality, a quiet warmth comes through.

Teen Version (mid-teens):
A slightly higher and lighter tone. Soft, quiet, with a touch of uncertainty about the future, but not overly emotional or unstable.