All Women's Assocation clubs in England are stand alone clubs with affiliations, or not, as the case may be, to "men's" clubs.
Most of the super league clubs have such affiliations with the exception of Bristol Academy.
But, interestingly, one of the most famous women's clubs, Doncaster Belles, were always a separate club from Doncaster Rovers. They got their name from Belle Vue, the home of the latter. But they merged with Rovers a few years back.
Not all premier league clubs have affiliated women's clubs, and in any case, the Women's leagues are run separately.
The standard of football is pretty high, skill wise, and actually in the opinion of many, it's better to watch, as skill is more of a factor than, say, brute force and speed.
The depth of quality is less, though.
Chelsea are the current champions and cup holders