Because she didn't want to marry and she knew that she was the fastest runner. She would challenge suitors to race her and she always won, meaning that she didn't have to marry them.
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Melanion was the man who actually beat Atalanta in the race for her hand in marriage. He had the help of Aphrodite, the goddess of love, who gave him three golden apples. Melanion would roll them off course to catch Atalanta's curiosity so he could take the lead. He won the race and her hand in marriage. He's also know as Hippomenes.
That fast girl's name was Atalanta.
Atalanta won footraces against all of her potential suitors until Hippomenes distracted her by dropping 3 Golden Apples.
Atalanta is a good soldier, able-bodied, swift and a fast runner that she declared that she would only marry the man who would outrun her on a race.
The answer is many: golden apples (her race with Melanion), and bears (the she-bear) and lions (what she was turned into) and spear (for fighting capabilities).