You need to see an experienced immigration attorney regarding your matter. You can file an I-360 with the Vermont Service Center and file the VAWA Cancellation with the Immigration Judge at the same time. However, because you are already in removal proceedings, you cannot file an I-485 concurrently with your I-360 because jurisdiction relating to the I-485 is now with the IJ. USCIS will entertain jurisdiction only if and after the IJ terminates proceedings, even if conditionally.
Unless you believe you have a very strong case of battery or extreme cruelty by your USC spouse, I would suggest that you focus on the I-360 because the Vermont Service Center is much more sympathetic and the standard of proof is much lower, requiring only "any credible evidence". If it is approved, you can then file an I-485 with the IJ. The VAWA cancellation is much harder to obtain because you need to show extreme hardship, among other things.
It doesn't sound as if you've tried the most obvious thing: to hire an immigration attorney.
This advice does not form an attorney-client relationship and is merely informative. It should not by itself be relied upon to address a legal concern.
I highly recommend you hire an immigration attorney with experience handling VAWA cases. If you were subjected to battery or extreme mental cruelty by your US citizen husband, you have a couple options. But, you need to get started right away. You could file an I-360 (by itself) and then ask ICE to administratively close your removal case while it is pending. But, they may not consider admin closure until the I-360 is approved. You cannot file an I-485 with USCIS until your removal case is terminated. If ICE will not admin close or terminate, then your only option will be VAWA Cancellation. You should discuss the pros and cons of your options with a qualified immigration lawyer. Are you scheduled before the Kansas City Immigration Court? When is your first hearing? I am in the St. Louis area and would be happy to consult with you. There are also many other good immigration attorneys in St. Louis and Kansas City. Best of luck!
My response to your question is for informational purposes only, and is not legal advice, nor does it create an attorney-client relationship.