Seems you're doing a good job thereand patience is what it takes. I'm not surprized she's pregnant and now that she trusts you, she will most likely give birth around your house.
Any chance you build a little house for her and put in a secluded place where she would feel safe? Some old blankets/towels inside would make a perfect "home" for now.
We build some houses for the strays years ago, to begin with, it was polystyrene boxes we taped together and coverved with thick plastic, but they moved in immediately.
I digged up some old pictures of the house Pjevs had in his recent years - you being the handy man you are, you could probably build one yourself.
I know people would most likely have you committed if they saw it, but have you tried laying down near her with treats in your hand? That way, she would feel safer.
Good luck!
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