The continuing adventures of a girl and her unicorn.
Fairly early, Phoebe is looking for a Christmas gift. Finally, she realizes the perfect one (however reluctantly), and frees her from the wish that she would be Phoebe's best friend. Marigold gives back that they shall continue to be friends.
A number of gag-a-day ones about friendship and their personality quirks. Some continuing ones -- about a spelling bee where her chief competitor is Max, the school play and her rivalry with Dakota, Valentines, and an invitation to a unicorn birthday party.