I'm sorry but I have to say something here. She has a right to have people not believe or think something about her? If some madman met her one day and decided that she was actually married to the tree in his front garden, would she be within her rights to kill him just so that no one alive believed her to be married? Does that apply to other beliefs about her, true or not?
The dwarves can think she's married all they want, but she doesn't have to let that opinion affect her actions. And if she doesn't act like she's married, doesn't respect the marriage, has escaped her husband, and would rather not have been in the first place, well that's hardly different to not being married at all.