I'm so sorry you're going through this. I've definitely had similar experiences too and even lost contact permanently with a friend who was in our wedding. This was a friend who was not married and had no children either.

I had one friend though who was my toughest customer when we first told her we were going to switch to homeschooling. She said some not very nice things about it. Both her and her husband have taught public school. She went on to research it for a year and is now homeschooling her kindergartner. So sometimes those that attack and question you the most can become huge advocates later!

Good luck! I know that's no fun and very stressful. Clearly, that friend has no clue what parenthood feels like. Since you suspect she is GT, I wonder what her own school experience was like? Interesting.