I didn't see a discussion about this, so my apologies if this has already been thoroughly analyzed.
As anyone who played the game knows, April can no longer shift in DF. Although it may be some mental issue, I have a different theory.
As the white of the kin said, April can't shift on her own and she doesn't know why that is, I think the answer is simple.
A shift goes through the world of dreams, we know that already. And we know the Guardian tells April that dreams are going one way only from Stark to Arcadia.
I think it would be logical to add 2+2 and deduce that as long as dreams are going one way, so April can only shift to Arcadia, or if she's there, she will be unable to return to Stark.
What do you think?