AAAWWW RICHARD, what a hard arse sweetheart you are.

I pray that you are able to get this little preggo somewhere safe to have her "Little Frens" because she just might have them under the house.
Can you put a little shelter for her outside with some old blankies or towels?
When you are putting food down for her, are you talking softly to her?
I'm glad she is starting to get a little closer to you. Try the next time you put food down to just stay there for a few minutes in a crouched position and see what she does. If she looks like she is going to bolt then just slowly walk away, if not and she comes to eat, then stay for a few minutes talking to her.

I almost spat my tea out when I read how see jumped out of the tall grass and scared the poop out of you. I can just picture it. LOL!!!!!!

Good luck with the precious girl and prayers on the way that there will be a good outcome to this.