"Having one ambulance turn up really quickly, only to have to wait another 10 minutes for another so there were enough people to drive and take care of Maia in the back of the ambulance ... It's not fair for anyone involved.
"The paramedics are doing a good job, there's just not enough of them."
Mrs Underwood-Cadman says she was compelled to share her experience from July 2015 after the Weekend Herald revealed a letter to the Government that said St John would stop sending some ambulances within two years because it could not guarantee the safety of patients with single crews.
St John chief executive Peter Bradley says the emergency service needs an injection of millions of dollars and hundreds of new emergency staff.
In light of Mrs Underwood-Cadman's account, St John said that in life-threatening situations at least two emergency staffers would be dispatched, though high demand could mean exceptions. In Maia's case, the urgency was well understood and resources were dispatched accordingly.