My miner is standing staring at a wall.
When I reset her, she starts back up at her hut, makes her way back and stares at the wall again. She eats and sleeps but doesn't work. She's made 2 levels with nodes and now just stares at the wall.
I previously contacted the author because of an issue I had with the released version on the game and he/she advices me to go onto the 1.15.2 Alpha which fixed my previous issue and now I have this one. I have spent a few hours trying to figure it out and nothing works.

Does she have a pickaxe, shovel, wood planks, torches, cobblestone, and fences?

When they stare at a wall make a tunnle into the direction they're staring

Yeah, it happens rarely through some glitch, but sometimes they get stuck due to that and mining them a little path fixes it.