The mother in the 3rd act wasn't evil.

She had every right to be cautious. A stray cat around a bird that was not familiar with, disease cats carry, she assumed the cat killed the pet bird, she seen the cat actually kill a bird. The things I see wrong is that she could've put the cat in the cellar instead of placing it outside where it will kill any small animal in the area. Who the heck would buy a loud arse bird like that for a kid's room.