2hand......I can identify with the frustration.
I have a 3 yo MiniS. He is neutered male. I am the only human in the house. I leave for work around 7:20 am and return home near 5:15 pm, often later. I do not have a suitable crate. Even if I did, I would not crate him for that long. Yes, I come home with an accident or two. I have a routine for quick clean up off the tile floors. Clean up the bulk, finish with a white vinegar/water mix, let air dry. This kills the urea residue. Fortunately, he only uses 1 location for relief. All the floors are tile.
When I am home, we take a walk outside every 4-6 hours, sometimes stretch to 8 hours, without incident.
This is just part of my life and the 5 minutes to clean up is just not a big bother.
Anyhow, Chis are quirky little guys on some behaviors. You may need to start from square one and handle the chore like she is a puppy. They can learn and you may need to adapt your outside schedule a bit.
To help break the habit, you may try placing her on a leash then keep her tethered to you. This will help prevent the roaming for a place to go. It could also allow you to learn her cues about needing to go outside.