Last month, the upper house MP was suspended from the Victorian Liberal Party for nine months for attending the rally headlined by British campaigner Kellie-Jay Keen-Minshull and crashed by neo-Nazis who performed Nazi salutes.
Ms Deeming had initially faced expulsion in a move triggered by party leader John Pesutto before it was withdrawn.
On Tuesday, the upper house MP confirmed she would "automatically" return to the party.
"This is my party and I'm not going anywhere," she told Sky News host Peta Credlin.
"I think it's really important that people understand how the law has changed and that women and girls are really vulnerable now because, you know, the definition of female doesn't exist clearly anymore."
"So we've lost the right to have our female only change rooms without men in them, our female only toilets without men in them.
"We've lost our right to our own sporting teams, you know, to scholarships, everything, even our own words to describe ourselves are gone and you know, to ask for those back has nothing to do with hate nothing at all. It's totally reasonable."
Deputy Premier Jacinta Allan had previously criticised Mr Pesutto for just suspending Ms Deeming, saying it showed he had failed to act against hate and bigotry.
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