I don't quite see her ever getting married, like the others said previously.
She is too dedicated to her job and helping others. Marriage and children are just not on her priority list. It seemed to me that she has a personality type that does not require companionship. Like a lot of independent business women today.
Queen made a valid point, she probably feels that the people/animals she protects are her children.
A lover would be fine... but that would cause many complications on her part and her lovers (most likely Dom, secretly I had hoped so too...) She is still dealing with her reputation and fighting to be equal to other knights... that could possibly ruin it. (Do we know if Kings Own are allowed to take lovers?.. I can't remember.)
Besides, in the end of Lady Knight I got the vibe that Kel was starting to enjoy Dom's friendship more than swooning over him...