She doesn't need to lower her standards. She needs to develop some standards. If she's dating emotionally unavailable men, she's likely emotionally unavailable herself and needs to figure that out. If she's dating guys who are "too attractive", says who? If they are attracted to her, who says that they are too attractive for her to date? It's not about attractiveness at all. If she keeps ending up as the side chick, she likely needs to look at her own patterns. Instead of lowering her standards, she needs to raise them. She needs to pay attention to red flags and respect herself--not dating less attractive men.