Fro was disguised as a member of the talk show, Love Line. Jedite charged flower broaches with dark energy to give to people, which would drain their energy.
When Fro revealed her true identity, she fought Sailor Moon, using her deadly breath as a weapon. Sailor Moon used Moon Tiara Magic, but Fro dodged it. Sailor Moon then sent the tiara back at Fro, slicing her in two and destroying her.
Likely on account of censorship, Sailor Moon's tiara is rarely shown hitting the enemy when it destroys them. However, it is clearly shown slicing Fro in two as she disintegrates.
↑as it usually shows her throwing her tiara, then it shows the monster disintegrating