Dude, you've only been in contact with her for four months and have yet to meet her? There's not enough there to claim a relationship.
And if she's hooked up with a friend she claimed she wasn't able to date in the past and now wants to date him at the same time?
The red flags are out and snapping in the breeze. I'd walk on.
When speaking of various forms of non-monogamy...it ain't poly if you're just fucking around.
While polyamory, open relationships, and swinging are all distinctly different approaches to non-monogamy, they are not mutually exlusive. Folks can, and some do, engage in more than one of them at a time--and it's all good.