I think a 3-star Vine would give you +-0ish now (off element, slightly less damage against Light) than a LMB Medusa. You can currently buy 2-star.
... but if you're that new, then your Medusa isn't LMB, right? So it should be an upgrade. Not a massive one, and possibly not even one you'll notice, but an upgrade.
And that's not a bad grid for somebody starting up. It'll take time to build it. Keep at it~I think you can just fake the emails? Put whatever you want in them. I think you can change them later, if the reroll turns out to be anything decent.