Jono, I could see your option c) playing out; While it was quite superb that BDD could win the mares hurdle on her first run over hurdles for the yard, i don't think she's to AJ's level over hurdles. Elliot has been quite bullish about her this year so far, and he can be quite honest when his horses aren't firing and has been in the past even solely with her.
Whilst Mullins and co suggest BDD is the mare version of Douvan, she wouldn't have shown that over hurdles. I do think they'd need to go back over fences to get to that level as her jumping is such an asset. However, will they do that considering she clearly injures herself? Who knows.
There is also a question mark on BDD on spring ground, she never faced lets say g/s or good, and didn't do so in France, other than on debut..
I can see Laurina going to the Mares in all likelihood, but it will be very interesting to see how they campaign her early doors.