Queen Lillian makes her debut in the film Shrek 2. Although initially surprised at Fiona's transformation into an ogre, she is far more understanding of what has happened and, seeing that her daughter is deeply in love, accepts Shrek into their family. When King Harold is turned back into the Frog King at the end of the movie, she still accepts him as she did years ago. It is revealed that she and Harold are the Princess and the frog from the famous fairy tale.
Shrek the Third
In Shrek the Third, she is widowed, and becomes a more determined character, leading the pack of princesses through a series of tunnels in the castle, and breaking two walls with her head, whilst humming "My Favorite Things" (an in-joke referring to the song sung by Julie Andrews in The Sound of Music) and "A Spoonful of Sugar" from "Mary Poppins", another role Andrews is famous for. She is able to rally the other princesses from being damsels in distress to independent fighters. It was also revealed in the movie that Fiona inherited her fighting skills from her mother (Lillian even asks "Well, you didn't think you got your fighting skills from your father, did you?") Lillian is seen after the movie's finale in Shrek's swamp home, happily seeing her grandchildren and plays with an ogre triplet, who is spits up on her dress she initially looks distressed and a little disgusted, this changes as she finds it adorable.
Shrek Forever After
Lillian is seen briefly in Shrek Forever After in a number of flashbacks, showing her and Harold's decision to visit Rumpelstiltskin to free their daughter from the curse before Shrek saved her. In the alternate universe it is revealed she and Harold literally disappeared after signing over the kingdom to Rumpelstiltskin. Her last appearance is at the end of the movie, seen celebrating the triplets' birthday.