Elīna Maligina went to court to contest the will, said her lawyer Pāvels Rebenoks.
A civil case has been started, but meetings are yet to be set.
"We think that the testament, read on January 16, does not reflect Maligins' last will. His last will was different, and we can prove it with documents and testimony in court. We have reason to believe that the testament, signed on February 16, 2016, was falsified," said the lawyer.
According to the current testament, Maligins' three surviving daughters were the primary beneficiaries of the will, which did not mention Elīna Maligina.
The last will also included the proviso that the inherited property can't be given away for the next five years.
The db.lv business portal estimated Maligins' wealth to be worth €70m last year. He owned 68% of the pharmacy giant.
Maligins died in December 2017, at the age of 52. Since that month, the values of the company's shares has fallen 11.46%.