Whether a lesbian (or for that matter a straight woman) counts themselves as masculine/gnc, or seems that way to others, is complex. I remember reading Sophy Ridge's The Women Who Shaped Politics, and she has an interesting interview w RD.
She does speak about aversion to dresses, and how she cut her hair 'the shortest it's ever been' when she ran for leader : 'I wasn't going to wear twinsets and pearls just to please them. I've been in the closet, I'm not going back in again for anyone.'
So these kinds of comments suggest to me that she does seem to see herself as GNC & that this is tied to her lesbianism, for her. But obviously people are going to describe those things in different ways.
To clarify, I don't think having behaviours, interests or dress traditionally considered masculine makes a woman any less of a woman. I'm just using it as a shorthand. Butch is used bc more lesbians (on average)than straight woman are to a larger degree GNC. But most lesbians don't mean that they are actually men, or that those things are unsuitable/incompatible w being a woman, quite the opposite.
Whether RD sees herself as masculine, butch etc or not, I think there's a stronger case for applying that to her (dislikes dresses etc, short hair important to her, hobbies like kickboxing & Territorial Army) than someone like Sandi Toksvig, who doesn't imo dress any differently than someone like, say, Angela Merkel.