Can she read your character's mind?: Absolutely! It's going to be awful and fucked up in there, but she's welcome to do it.
Can she dig deeper in your character's mind?: Yep! Just hit me up so I know to describe it.
What does your character's mind look like?:
yikes 🧍‍♀️

Marazhai's mind will absolutely take the shape of his home "dimension" (it's complicated but also dw about it), Commoragh, ans specifically the interior of a Spire. It's a Drukhari equivalent of a palace, since he's essentially a prince, but everything about the architecture and presentation just gives off "harsh" vibes. It's sharp angles, sickly greens, and absolutely no natural light—It's a dimension with no sun, no flora, no fauna, etc. There's likely also an undercurrent of pain and I'll intentionally leave that up to interpretation because it can mean a lot of things/all of them. Physical, emotional, his own, other peoples',etc. It's a very key part of his culture.

Can she dreamwalk in your character's dreams?:
She can, but she probably will not want to lmao... Even his more innocuous/nonsensical dreams are going to be extremely unpleasant and likely a nightmare to anyone else. His culture is incredibly harsh and vicious, and even as he's gotten more aquainted with humanity, it's not like they're having a good time of things either. His canon/setting is just Grimdark™️ that way.

Recurring dreams are about torture (of himself, of giving to others), fighting to his death in an arena of spectators, and being devoured by an unseen entity.

things are real normal in his brain can you tell,,,