Just want to put it out there that the standard for tv/movie moms is SO much higher than for tv/movie dads. If Dad never cooks meals no one notices. If he forget's his child's birthday it's bad but not damning. Sometimes it's even played off as charming, in a doofy forgetful dad kind of way. If Dad cooks meals sometimes and gets his kid a thoughtful birthday on their birthday - automatically Dad of the year. For tv/movie moms, this is the bare minimum. It should be the bare minimum for any parent, but alas....

That said...

Lucille Bluth of Arrested Development

Stepmom from Fleabag (if she even counts as a mother...I don't think she really does)

Marianne's mom in Normal People

Eleanor and Tahani's moms in The Good Place...although we get to see both moms grow into better people...