Interesting "Origin Story", but they've done her a disservice I feel like they've overdone it in trying to portray how her appearance was judged. I have no doubt that she was deemed to unattractive to be on TV. Still happens today I'm sure.
However, they have made the character appear almost twice the size she was. Go back and watch the original first series. She's no where NEAR that big. She looks like your average woman.
I get that the story is trying to make the point that she was seen as "hefty", but this portrayal is somehow much worse.
If the moral of the story is don't judge a book etc. , they've missed the mark.