Thanks to all for suggestions and support regarding Greta! Greta doesn't seem to mind the diapers (wonder if they make her feel safe somehow) and I do think she is afraid of the dark. If I take her out with the boys at 9 p.m. when it is still light, she seems to do okay.
I thought this might be from all the chaos she has been through the past year but both my mother and brother told me you have to ignore her or she will just want to come in again. In fact, she will stand outside the window to see if you are watching her (did this here too) and not do her business.
When DH gets home, he is going to put more flood lights out back so that should help as well. I'm just relieved she doesn't mind sleeping in diapers until things are resolved.
Oh and check out my new flower! It is a double coneflower! I love it!