Originally Posted by Mjölnir
I took it as effects that appear from people travelling the Rainbow Bridge, given that it appears when Thor comes. Asgardians probably don't travel there often but since Midgard is the mid realm you would probably pass it even if you're going to another realm, which could be why she's seen it before.
That makes sense. Though it stood out because she kept saying there was a pattern. Then she finds Thor on one of the expeditions.
I do hope they explore exactly what she has been researching. Jane's research was very important in the movie and SHIELD wanted her to continue, but it is never explained...lol