When the first "Carry On" film was made in 1958, Jacques formed part of the cast. This series would go on to employ the same group of actors who would collectively become known as the "Carry On team". Jacques appeared in 14 of these films over a 15-year period and like many of her "Carry On" co-stars, she quickly became typecast. A recurring role for Jacques was a no-nonsense matron which she played in five of the films – "Carry On Nurse", "Carry On Doctor", "Carry On Again Doctor", "Carry On Camping" and "Carry On Matron". She became known by the team as a "Mother Hen" figure, and was a close friend to many of her co-stars, including Kenneth Williams and Joan Sims, whom Jacques provided with a great deal of advice and practical help. In return, Sims regarded Jacques as her "greatest friend", and as "both a sister and a mother to me". Jacques would frequently invite Sims, Williams and Hawtrey to her house for Christmas dinner.