I found this review about the show and they said the episode with Elizabeth is one of the best. 😀 Oh it contains spoilers.
One of the bravest things the series tackles this season is the unexpected death of Mel’s mother. It’s a difficult topic for any child to consider, let alone experience, and the show handles the storyline with impeccable grace. The episode, “Mel vs. the Future” is one of this finest episodes you will see this year in all of television. And I can’t stress enough the performances of the series’ young actors — Emmy committee take note.
I also find this article, they only mentioned Liz but I thought to share it anyway!