If the leaks are valid, then someone sent her an email about Nibiru. But it’s just a spam email of the type that says at the bottom “send this to all your friends” and someone apparently sent it to her.

From: Does Clinton believe in Nibiru? Doom planet 'proof 'in emails released by Wikileaks

“Checks by Daily Express found it is actually a generic email which Mr Salter has been sending to people, and posting online, urging others to do the same since at least 2014.

In the comments section of a story on Sott.net published in January 2014 about a rise in meteor strikes on earth, Mr Smalter posted the same text sent by email to Mr Podesta.

At the bottom he added: "Be concerned for others. Forward this to relatives, friends, media, etc."”

So, no, it doesn’t mean she believes in Nibiru. It doesn’t even mean the person who sent it to her did, people don’t necessarily believe everything they forward, it could be amusing, or fun, or silly and forwarded for that reason.

All you can conclude is that she had a Nibiru email in her inbox. Can’t even conclude that she read it as she might have just glanced at the title and ignored it.