Here is the full picture from the wedding of Princess Cristina of Bourbon-Two Sicilies, taken on 15 July 1994. Now I see Princess Maria Cristina is also in it, cut out of this picture and posted in some of the previous messages: she is wearing blue, standing at the right of Queen Sofia of Spain.
The caption is clear, mentioning both Princess Françoise (sic) and Princess Christine (sic) of Bourbon-Parma.
Most of the guests are easy to recognise, so it must be the sisters of Princess Alice.

Next to right: couple (must be the parents of the groom); Countess of Paris (maternal grandmother of the bride); Queen Sofia of Spain; Princess Maria Cristina of Bourbon-Parma; groom and bride; Infante Alice, née Princess of Bourbon-Parma (paternal grandmother of the bride); King Juan Carlos of Spain with in front of him Princess Maria Francesca of Bourbon-Parma in wheel chair; Princess Anne and Infante Carlo (parents of the bride); two girls (probably sisters of the groom)
Behind Queen Sofia of Spain: her daughters Infanta Elena of Spain and Infanta Cristina of Spain; Prince Pedro of Bourbon-Two Sicilies; Princess Victoria of Bourbon-TS; Princess Inès of Bourbon-TS; Infante Felipe of Spain; Princess Maria of Bourbon-TS; hidden lady behind King Juan Carlos.
I am confused now, as the sources ("Le Petit Gotha"; "Online Gotha of Paul Theroff") I've found, give all as death date for Princess Maria Francesca 20 February 1994, so almost five months before this actual wedding. The other sisters died before her, as the last one before her was Princess Elisabetta, who died in 1983.
Eric VdV