Hi guys, sorry for the lack of updates.
I hadn't subscribed to this thread so I didn't get notified that anyone had posted anything.
Go me.
She's doing great - this is her outdoor enclosure (I shot this through the blinds yesterday).
It's a blocked off part of my porch, so she can't get out, that has about half a day of sun. She has her own bin with water (that I clean and refill every two days), a ramp in and out of the water, and her own sun for as long as she wants to sit there. She's not chowing down on cuttlebone as voraciously as before, and having this setup means solicitors think twice before ringing my doorbell.
The ramp serves as a hiding place for when she's caught out of the water and scared. When we open the screen door at night, she will look at us from her water and just float there on top until one of us picks her up and dries her off. Then she toddles her way into the house and goes to her sleeping box (a box with old clothes in it) and doesn't come out until we're all up in the morning.
Even with building a new pond in the back, my husband said he'd love to keep her as a house turtle (though I am going to make her a special enclosure in the back yard so she can hang out there too but still come in at night). She comes up to us and stops, and will sit totally limp and still as we pick her up and give her head pets and skritches. She never snaps or bites or hisses and I am totally comfortable with her around the kids (they know to play gently). Her shell looks like it's ok, and I've stopped the treatments for now.
She's still so cute and friendly.