Firstly, welcome to the wonderful world of refereeing!
Secondly, welcome to the even more glorious world of RefChat!
Yes, Sian's the most well known. She is currently a 2B referee and a FIFA (and SG) AR. She middles Conference North/South.
The names to look out for in terms of female officials - Alexandra (Sasa) Ihringova and Lucy May. Sasa is FL line/Level 3 men's ref and FIFA women's ref. Lucy is men's L4 and I think top level women's AR, but not yet FIFA. (My knowledge is neither cool nor nothing to be proud of!)