Not sure what could have made it better or unique. Lifetime has a "twin movie" template. This isn't one of the better ones and the movie kind of just happens. There are better twin thrillers on the network, and one that's maybe a bit similar to this one is Killer Twin, even right down to how the evil twin is revealed in the climax.
One thing that's frustrating about this movie is that we are constantly questioning which twin is which until the "Evil Twin" (name drop) does something villainous. No matter the scene. I know it's necessary, but after a couple of times, I was over it. I don't know if it's cheaper to pay one person over an actual twin set ( I would assume one actress gets paid more for basically double work), but the back and forth got old for me. It's Lifetime, sure, but earlier this year, HM used Jeremy Jordan as twins and he actually made them two different characters. Sarah Michelle Gellar played twins on Ringer. And of course, my all time favorite at this point, Tatiana Maslany played so many clones with each of them having a unique personality, that I know it can be done! For actual twins there was the Ruby series (on Lifetime), Cynthia/Brittany Daniel, and of course Mary-Kate/Ashley or Tia/Tamera. These twins you can see the difference once you look long enough and their personalities differ enough to be noticeable. Lifetime also had My Sister's Secret where the one actress seemed like two different people. Lifetime has also had a couple of twin brother flicks and same thing. I don't think simply being the non-murderous twin is a personality.
IDK, I don't necessarily fault the actress, but sometimes I'd rather they just fool the characters not the audience. It gets tiresome when it drags on.