I'm in the industry. Have been a nanny and childcarer over the last 10 years.

From what I can tell, it's really hard to get a good nanny in the cities. So I would say to your friend to walk. I have never taken a job where they try to negotiate my pay rate down. If they start off the relationship this way, it is just going to get increasingly demanding, and they will continue trying to rip her off - I have seen it so SO many times.

I also feel that if someone can't decide to put their trust in me after a first meeting, then I will never fully have their trust, so I won't do it.

Tell your friend to cut her losses. Where is she? If in Sydney or Melbourne, I often hear of nanny jobs going down there, am happy to put her in contact.