Why is it a smear? There is a solid case. She lies on the divorce documents - stating she has had no contact with husband 2 (possibly her brother) since 2011, but has been in touch constantly on social media. She's been desperately deleting her social media activities (such as commenting on his photos) but people have mirrored her posts to preserve them.
Lying on that form is actually perjury and is serious. It carries a fine of 20k and a few years in jail. That alone is basis for a full investigation.