Though her appearance was brief, the little squirrel was excited, cheerful and determined to make Arthur her mate and earn his love. She was dedicated to Arthur enough to save him from the wolf. She was heartbroken when she learned Arthur was not a squirrel but a human boy.
In the film, the little girl squirrel is first seen meeting Arthur as a squirrel eye to eye, face to face, when the both of them were running up to each other. After greeting her with a smile, Arthur then looked down both ways, and the female wouldn't let him get by, at first thinking she wanted to move past him. Immediately after moving out of her way, she came to and started sniffing him, then after he placed his hands on her nose to keep her away, she did the same to him and tried to keep his hands on her, thinking it was a game. Merlin confirmed for Arthur that she had become in love with him. Later, she keeps pestering him, even though Arthur tried to keep her away from him and told her that he was a human boy not a squirrel, but she either didn't understand him or was too excited to listen. Also, when Arthur put her tail on herself, pushed her and ran off, she picked it up and looked at Arthur while giggling, and then chittered, "Ooohh!" (like an in-love sound). She even grabbed him by the face and kissed him (three times). Also, while chasing Arthur (who hid in Merlin's tail), the little girl squirrel went over to Merlin and smiled (which meant that she kindly asked him where Arthur went), and Merlin pointed at his tail, and the female found Arthur and continued harassing and chasing him all over the place, with Merlin singing "A Most Befuddling Thing".
While chasing Arthur, when she saw the wolf getting ready to eat him, she saved Arthur by chewing on the wolf's leg, causing him to yelp. He then chased her, trying to bite her tail, but she managed to escape by making the wolf fall down a hill into a log and end up floating down a river stuck in the log.