Arielle Scarcella wanted to define sex according to secondary sex characteristics but she did not do a very good job at defending that (correct position) possibly due to her not actually believing in that. It is likely that she has a more extreme view (defining sex by chromosomes) but decided to abandon that becuase it's indefensible
what about abnormal (more masculine) cis females
You can have a stricter standard for becoming a citizen of a country than to remain a citizen, this is often required to prevent abuse, we do want higher standards to change your legal sex to female than to keep your female legal sex. This may seem unfair but nothing is fair in this world, if you are not born with something you might have to work hard to earn it.
Females without a vagina are indeed less female and from a biological perspective they are less important, this is of course not how our current society value people, instead today it's mostly about you being able to make males sexually satisfied.