Sounds like a good plan; I especially like the idea of checking in with a poly-friendly therapist.
Can I ask, how are you and CG currently getting along? Did things smooth out after those initial conversations? Any idea why she initially reacted so crazy-like? Did she think you were being too forward, or too reserved?
Keep up the good communication between you and DH, and try to increase/enhance your communication with CG as well. And about those "not yes and not no" questions, if they are still bothering you, don't hesitate to post them and I'll try to give you a definite yes or no.
Well wishes and regards,