What if we had our cake and ate it too?
Show some lightning but not the full blast, allowing the ship to escape. A few thin tendrils escaping her fingers would highlight that the power is coming from a dark place while not being so destructive that it would frighten her out of using it.
I just think it’s a pretty effective scene as is (or at least it would be if it wasn’t undercut moments later). It jolts the viewer awake, or at least it did for me in the theater. Personally I have no problem with the idea that Rey has latent darkness within her that’s she’s actively trying to struggle against, yet she can’t help but be pulled down that path. I don’t necessarily see the benefits of having it be something that she’s choosing to tap into.