She started her dance studies at the Africa Guzman School. She graduated with Honours at the Royal Academy of Dance, later she joined its Youth Ballet. From 1999 she was first dancer of the Company. In 2003 was invited to participate at the Adelina Genee Compettion in Sydney and to dance at the Best Dancer ACADE Gala.

Casa went on with her studies at Steps on Broadway and at ABT Ballet School. In 2005 she danced at the New York International Ballet Competition where she obtained a recommendation from the ABT Studio Director, Mr. John Meehan.

She got first prize at the Castellón City Awards, granted with a scholarship to study with the Compañía Nacional de Danza de Nacho Duato and with The London Studio Center, then joining to this company.

She has been working at the Ireland Ballet and at the English National Ballet.

Cristina Casa has performed soloist and principal roles as: Aurora and Golden Fairly in "The Sleeping Beauty"; Stepsister in "Cinderella"; "La Serenada"; "La Vivanderie"; "Giselle"; Gamzatti Suite in "La Bayadère"; "Carmen Suite"; Claire in "The Nutcracker"; Kitry and Don Quixote's friend in "Don Quixote"; "Pineapple Poll"; Small Swans and Black Swan Pas de Deux in "The Swan Lake"; "Diana & Acteón Pas de Deux"; "Concerto Barrocco"; George Balanchine's "Tchaikovsky Pas de Deux Variation" and "Who Cares? varation". On Contemporany repertoire she has performed Complexión Contemporany Ballet's works with Desmond Ricardson and Sandra Brown, and also Técnica Limón works as "Choreographic Offerin".

In 2008 she jointed Corella Ballet and was promoted to Soloist in 2009. Her roles with the company include: First and Second Variation in Makarova's "La Bayadère"; Red and Pink Pas de Deux in "Bruch Violín Concerto"; Soloist Classical Couple "In The Upper Room"; Fourth Principal Couple in "String Sextet", Quartet in "VIII"; First Girl in "Fancy Free"; "Epimetheus"; "The Taming of the Shrew Pas de Deux"; "Swan Lake Pas de Trois", etc.