Problem is that we don't know for sure who the mysterious 7th member is... If it's Astrid (and we don't have a more credible candidate at this point IMHO), and given that obviously Veronica and her are very close, having a sisterly bond, the more reasonable conclussion is them forming a power bloc with their mother...
And if they support Alessandra, she has four votes, meaning she's already won. It doesn't seem like that right now.
So, for the combination you mentioned being right, 7th member shouldn't be Astrid. Then who?
I really love this game. So much intrigue