Ok, spoke to someone there on the phone. I am completely unimpressed. According to him (and he never said his name - he was the guy who answered the phone) the Daughter can work or do whatever she likes because she came in as a dependent on me and holds a residency card. I explained to him that SHE is not Irish, but an American, and he said the residency card says she can work so she can work as much as she likes and it should not impact her dependent status. I made sure he knew her age.
When I told him that the EU help service that the Scottish Government set up said she should not be working or she would risk her "dependent" status, he said that was completely inaccurate, and that they were discussing UK law, not EU law and that they didn't know what they were talking about. (They had sent me the official government guidance doc on dependency.) He also insisted that she does NOT have to register for pre-settled status (which the government web pages say she does) because I am Irish. That bit I know is absolutely incorrect. I told him she already had pre-settled.
So, wow. He also suggested that I could call the Home Office, which I'm going to do to get it from them. He wasn't exactly sure who at the Home Office to phone. So, is this a legitimate lawyer referral - I dialed 0207-953-3090 for Medivisas.com - or someone with a similar name?
At least it didn't cost me anything.