Madigan is only a women's officer at a tiny local branch of the Labour party in Rochester & Strood, though. That's hardly an inappropriate position for an 18 year old, and not really one that you need extensive experience to fill.
//When I was growing up there were Men & Women you took your pick. //
That's exactly what this person is doing. She (or he, if you must) is attempting to transition from male to female. That is - appropriately - a very long and arduous process, and one that she does not appear to be taking lightly. I do understand some of the frustration people feel with the trans movement: personally, I part ways with many trans activists in the debate over allowing children to transition, and at the point where people begin identifying as "nonbinary" or "genderquer" and actively make up new pronouns.
None of this is a case of that, though. This is a legal adult who has made a decision for herself, and the people who voted her into this tiny and insignificant local role are evidently happy that she is sufficiently qualified to do it.