According to the Naruto wiki:
Their vision can be restored by transplanting the Mangekyō Sharingan of an Uchiha with strong blood ties — ideally a sibling — thus awakening the so-called Eternal Mangekyō Sharingan
Since Sarada doesn't have any siblings, this means that the closest relative to her with the Uchiha blood would be her father. Apparently, since this is not ideal, does it mean that Sarada will never obtain the Eternal Mangekyō Sharingan?