Well she could be forgiven on that one - we don't know how many people Servalan took aboard the Liberator.
Plus when you had
Blake
Avon
Gan
Vlia
Cally
Jenna
That makes six (unless you count Cally as not human)
She only took three others with her as she only had four functional teleport bracelets (from the crew minus Vila, who was still on the ship, I'm assuming the bracelet found by Avon was either a fake or broken).
I always assumed it was a real Liberator bracelet, Blake and co must have left dozens scattered around the galaxy

and that Servalan was using it to beam the signals to Avon. She definitely only took 3 people with her. I'm assumning she would have taken her other 2 if they hadn't been killed by the links...
Trivia wise...B7 was a replacement show for Z-Cars, a police drama. The downside is that B7 basically got Z-Cars' budget! amazing B7 looks as good as it does.