Hello WH,
If she was being honest with you and wanted to prove herself to you, what logical reason could there ever be for her not wanting you there? The answer, There isnt one.
Personally, I think this is just a ploy to create drama so she doesnt end up going. To create a "well the heck with it then" environment that she can spin in her favor later.
I would call her bluff and just have her go to take it and they'll send you the results. I agree that you want to confirm its actually her that shows up. Alot of times they'll confirm the person's name in the questioning anyways.
The only reason I say to do this, is you need some sort of closure on this. You've gotten alot of good advice from others in this post. But decision making will be easier if you truly know the full depth of what your dealing with here.
If I were you, I would try not to take the bait. Shes trying to create an environment where you escalate. Try to stay calm and dont feed into it. When she gets you upset, she's dominating you by hijacking your emotions and manipulating you. You can show your strength by not allowing that, shut it down calmly or walk away. Show her she cannot effect your emotions.
Even if she does take the test it doesnt sound at all like she is truly invested in reconciliation. I agree with others that you need to focus on yourself and what is best for you. I understand the situation with the children, but if you both are unable to reconcile this and have a healthy relationship, they'd be much better off having two parents that love them that are separated in healthy environments vs. A hostile environment with you trying to stay together. You can still play a huge part in their lives whether your together or not.
Overall, no one is going to look out for you, but yourself in this situation. Dig deep and be your own advocate.
I understand exactly how hard this is and I feel for you deeply here. Good luck and keep us posted on how it goes.
[This message edited by TheBetrayedHusband at 7:50 PM, Friday, January 9th]