30k is what remained on mortgage. She is getting 1/2 of what home appraised for.
The 30k for the balance of the mortgage should come off the top before dividing the remainder in half. Example: If the house is worth 200k, and the mortgage balance is 30k, then the amount of equity you divide is 170k or 85k each.
However, I do not believe that its the house per se that is causing your wife to dig in her heels. She really does seem to believe that you are hiding assets or otherwise playing games with her, and therefore she is not going to back down until she is certain that she is not getting scammed.
I am not accusing you of anything. I am trying to help you understand her potential motivation. However, you do come across as a bit cagey. When you don't want to answer a question you dance around it and when someone gives you fact specific advice you tend to simply pretend it never happened.
I also think that you are biting yourself in the behind if you want her out and you keep insisting on putting her share of the money in escrow with your attorney.