This isn't subversion, or any sort of theocratic hellscape.

Girl could have gotten an abortion 100% legally up through 20 weeks of preganancy. At 24 weeks the fetus becomes viable outside the womb. At 28 weeks she (with the assistance of her mother) took meds to kill the fetus and induce a stillbirth, commenting that she couldn't wait to be able to wear jeans again.

She goes through natural labor to pass the stillbirth outside of any medical facility or supervision, burns the remains, and buries them on a farm. When questioned by police, she and her mother admit to using Facebook Messenger to discuss their plans.

The only thing in any way related to the romanticized fiction of some sort of downtrodden freedom seeker you're talking about is that using encrypted communications would have prevented their discussions from being available to be subpeona'd. That said, admitting to police you even had those discussions in the first place kind of defeats the damn purpose.