Ah a tricky problem. You may have to wait until you know for sure how the sensei treats his daughter - ie as someone special "she's just trying to help" or whether he is harder on her than other students.
For my part, I will come down on anyone who stops their own training to help or interfere with the person next to them. If I wanted them to help others, I would tell them so. Otherwise it's a case of leave-them-alone.
Some people, and it sounds like you are similar, would rather watch, copy and try and if you need any help would ask for it otherwise someone else "interfering" just puts you off.
But that's the way I run a class, and everyone is different I guess. Also I have other senseis who either help or train with me in all my classes which provides another avenue for people who don't want to come to me directly for whatever reason.
For example, I recently spoke to one of my senior students about how I wanted them to treat the newer people in sparring because I heard of a gripe through one of the other senseis in the class. They told the complaining student to come to me but I had already found out about it by the time they did - which made them doubly happy that I was already on it.
Mick