It really all depends on the evidence. Assuming this elder is not so virtuous--and assuming he really did "come on" to her, we might also assume that he's not going to be honest about what happened. And if not--and if there was no corroborating evidence--it becomes one person's word against another's. He could flatly deny he did it, or could just say that she misinterpreted it, which (let's face it) does happen sometimes.
If there is corroborating evidence--or he confesses to it--he will very possibly lose his position as elder, especially so if this information becomes known to others in the congregation. There might even be further action taken toward reproving him.