My Dearest Nanners,
I am so sorry this is escalating and I know exactly how you feel. You have every right to be upset and setting down ground rules is a good thing. I also know it hurts us more then it does them to have to say no to their behavior and requests so please know you are not alone.
You know I am going through some of the same worries with my son in Oregon but I am at a loss as how to help in anyway as it is my daughter-in-law that is behaving much as your daughter.
Only when our adult children are forced to face the consequences of their own actions—their own choices—will it finally begin to sink in how deep their patterns of dependence and avoidance have become. And only then will we as parents be able to take the next step to real healing, forever ending our enabling habits and behaviors. You have taken this step and it is a hard pill to swallow as no matter what they are still our children but you are not enabling her, you are making her take responsibility for her behavior.
You will always have my prayers and support dear friend.
I want you to take care of you and with your Crohn's the stress is bound to kick it in. I am so very sad that you are in a bad place but know you have lots of (((((((((((HUGS)))))))))))))) coming your way.
You know you can vent here anytime you want to or need too.
I wish you peace,
Kitt