I've mentioned before that Elenna is not a very hard character to ship with; she's open to at least trying and seeing where it goes more often than not as long as she likes the other person, and she's happy with casual or serious. But what she is NOT likely to do is get married. Some would call that a fear of commitment, but it isn't really. She doesn't mind being in a committed monogamous relationship, and she certainly wouldn't cheat. It's more that she has a very strong aversion to belonging to anyone else, even just symbolically, and she associates marriage with that. That's not just a turn off, it genuinely frightens her. Possessiveness is the easiest way to kill a relationship with her instantly. If marriage was important to someone with her, they would have to convince her it came with absolutely none of that. No one lays claim to Elenna except herself.