CalMac said it had been in contact with Carol-Anne about travel arrangements
A spokesperson said: “We were able to get another space for Carol-Anne to go to the hospital appointment and she travelled with three of her four children.
“There was no risk of the hospital appointment being missed as we always had mother and child booked on the sailing.
“All alternatives offered were to allow additional children who had not originally been booked on.”
Transport Scotland said that under its contract with CalMac it expected essential services to be delivered.
A spokesperson said: “We recognise the impact that delays and disruption have regrettably had on our island communities and we are committed to investing in our ferry services.
“In the coming year, we will invest over £530m maintaining and enhancing our networks and strengthening resilience of services on the west coast and northern isles.”
MV Isle of Lewis is due to be back in service in time for the family’s return journey.