Should I swap Rebecca's character with her teenage daughter?

I had an idea to replace Rebecca with one of her daughters. I had originally conceptualized her daughters younger. As in under 10. However, this could easily be shifter to introduce one or both of them as characters in the story. Here is a list of advantages and disadvantages to such a modification.

Advantage

• potentially raise the stakes for the audience as her youth makes her capture even more tragic.

• It would afford Nathan and Rebecca to separately attempt to rescue her.

  • A damsel in distress trope.

• I could write the new world from a youth’s perspective, having grown up most or even all of her life in the aftermath.

Disadvantage

• I would have to explain why sanctuary allowed her to be a scout.

  • Her mother would likely have protected her from such a duty if at all possible.

  • Her youth and inexperience would make it less likely she would be a valid candidate

    • Perhaps in the new world, the sanctuary has created a rite of passage ritual that all youngsters must follow. The rite of passage trope has been used to great effect in many stories in the genre. Most notably City of ember, how the main character became a runner.

  • Her gender would make her less likely to be chosen, as historically females have been placed in safer roles. This, however, might easily be overcome by the personality of the character. Perhaps she has a desire to find her father, which could have led her to cultivate the strength and skills necessary to be qualified for such a role. This non-traditional role for a female character may fit into a more modern expectation of a woman in this genre.

    • Strong female character trope

Other thoughts

Perhaps other characters, like Dearil, could also be modified to be younger. This shift in ages may allow me to make this a YA book. Later I will do some research into if this is even a good idea.