In the manga, after Sherwood makes use of a Triffid against Hime, Hime turns the tables on her sister by embracing her, ensuring the Triffid will squeeze them both to death if Sherwood doesn't call it off.
The anime alters this. Hime and the others simply burn the Triffid down, and then launch it against Sherwood, who turns it to her own moment by surviving until sunset, when the Triffid withers and dies.
The battle with these werewolves is also a Crowning Moment for Riza. Up to that point, a large deal was made about how much more powerful a full blooded werewolf was against a half-breed like Riza. However, after one of the werewolves makes some disparaging remarks about Riza's parents (suggesting that her father was in wolf form when he mated with her mother), she manages to come out on top of the fight and leave his corpse for Hime to finish off.
During Hime's first dealing with Reiri, Hime willingly took in vampire blood and used that information to track Reiri to her home, where she forced Reiri's hand with a white ash stake.
In the anime, the scene plays out differently, with Reiri actually making it into Hime's mansion. Hime draws Reiri into a tight embrace, learns that Reiri cannot disperse into bats while being held, and then proceeds to menace her with the stake while Reiri is held by Flandre.
Hime successfully figures out that they are in Hiro's dream when under assault by a dream world. She then uses a masterful Batman Gambit, knowing that Flandre would call in Sherwood for help, and that Sherwood would provide her blood to a dangerously weak Hiro. When Hiro tastes blood, he immediately dreams of Hime, ejecting the real Hime from the dream. She then follows Flandre to the assassin, a member of the Race of Yith, and her face is the last thing the would be killer sees.
The anime plays this scene slightly differently. Initially the fish man, named Poseidon in the anime, manages to shove Riza aside like a rag doll. Then she gets a look at the full moon, and she becomes an unstoppable force.
Riza's race with the Headless Horseman is also of note.
Riza and Reiri get a joint moment when facing off against Nakua, a spider-deity that has been feeding off the students at Hiro's school.