Ontario Provincial Police received a complaint Saturday from someone who said he had viewed the incidents on his computer the night before.
Officers were able to identify the woman and locate her residence, where they executed a search warrant and seized several computers.
She is charged with bestiality, sexual assault, sexual interference and sexual exploitation, and police say she could face additional charges.
“Further charges relating to the making, possession and distribution of child pornography may be laid after the computers are examined,” said Const. Janet Hayes.
The woman's name is not being released to protect the identity of the child, who is now in the custody of the Children's Aid Society.
The woman was to appear in court Monday for a bail hearing.