Re: should I get rid of little toilet seat?
I have to tell you, she will never master #2 until you take the pull up away. Even then she may have some accidents before she gets it down completely. But she is old enough to understand the concept of using the toilet and she has you in a power struggle. Take away the pull up. Once she goes in her underwear she will most likely hate the feeling and hopefully that will be enough to get her on the toilet.
Honestly, I don't see what difference the smaller ring makes. Some children find it easy and others just don't like it.
When I was having trouble potty training my daughter I set a timer to go off every hour and made her sit on the potty for a couple of minutes. It can be very time consuming, but it did work. Whatever you decide you need to be consistent with her.