After talking to Mantis some more, Allura then leaves and later comes back with another Altean woman. And with the space mice on shoulders, because they've missed Allura. The other Altean woman, well, maybe more a teenage girl than a woman, has a light skin and is a blonde. Definitely seems a few years younger than the princess.

"Keith wanted to go and ask Hiroki Shiro about something, so I left him to that. Mantis, this is Romelle, she's from an Altean colony. Romelle, this is Mantis, from Earth... another Earth? Some reality's Earth," Allura says.