Yes, she has been sainted due to her tireless work as a Friend to All Small And Vulnerable Creatures, esp. children and animals.
Yes, Saint Gillian, also known as Saint Egidia, was a medieval saint known for her piety and care for the sick and poor. She is often venerated as the patron saint of the mentally ill and those who suffer from physical ailments.
I can find no saint named Gillian.
Gillian Quinn's birth name is Gillian Roe.
Gillian Pike's birth name is Gillian Levy.
Gillian Barge's birth name is Gillian Bargh.
Gillian Lind's birth name is Gillian Pratt.
Gillian Walnes's birth name is Gillian Karen.
Gillian Steventon's birth name is Gillian Parker.
Gillian
Gillian Lynne's birth name is Gillian Barbara Pyrke.
Gillian Sheldon's birth name is Gillian Stansfield Sheldon.
Gillian Apps's birth name is Gillian Mary Apps.
Gillian Armstrong's birth name is Gillian May Armstrong.