She can still be recruited as a follower, but her default Steel apparel will be replaced with a full set of Blades Armor and a Blades sword. Lydia, like most followers, has the option of being recruited into The Blades by being brought to Delphine at Sky Haven Temple after the quest Alduin's Wall is completed. If enough time was spent with her, she may gift the Dragonborn with a radiant item upon reuniting with her. If Breezehome in Whiterun is owned, she will return there instead. If the Dragonborn and Lydia part ways, she returns to Dragonsreach. This can happen if the Dragonborn damages her at low health. Just like other followers, Lydia can die if she does not get the opportunity to heal herself when knocked down.
