Megan's lawyers have asked a judge to prevent Lanez from harassing her via third parties.
They accuse blogger Milagro Elizabeth Cooper, known online as Milagro Gramz, of being a "mouthpiece" and "puppet" sharing misinformation about the case on behalf of the jailed Canadian rapper.
The filing from Megan's lawyers alleges Lanez, 32, discussed payments to Milagro with his dad, Sonstar Peterson, from prison, but his lawyers say any payments to the blogger from Sonstar had nothing to do with Lanez or his case.
Milagro's representatives declined to comment on the filing when contacted by Newsbeat but said a response to be heard in a separate lawsuit would "speak for itself".