
Yep, there are two mirrors, but Hathor is the owner of the one mirror that showed up in the bathroom where Horus and Seth were having sex, in chapter 201 (Hathor's flower goddess lackey is the one who sent the mirror there, through the flower stuck inside Horus' pants). I don't disagree that Sekhmet might be the second "owner" of the mirrors, since she is depicted on the back of them too and she can also able to summon the mirrors at will (there are even theories that Hathor and Sekhmet are in this story just like they are in their myth equivalents, where they're each other's alter-ego... so either the same person, or like, twins separated at birth... or, something similar...); but if we go by what has been explitely said in the story so far, it has only been specifically said that those are Ra the sun god's mirrors, that Ra gave to her daughter Hathor (but yeah, I think that definitely would have to mean that through Hathor, they would also have been given to Sekhmet, if Sekhmet really turns out to be like Hathor's alter ego, or something).
That mirror's such a peeping tom