('disapproving') She had a reputation for being an 'ambulance chaser'. [=a lawyer who gets clients by convincing accident victims that they should file a lawsuit about the accident]
She was taken 'by ambulance' [=in an ambulance] to the hospital.
They called (for) an 'ambulance'.
(..) ...what do you fear? Bruce? It's okay. It's okay. You'll be okay. ALFRED: Will we be needing an ambulance, Master Wayne? THOMAS: No, I'll set the bone and take him for an x-ray later. ALFRED: Very good, sir. - I'm very sorry, sir. I've told... (..)2005 Batman Begins