Are you planning NOT to tell her about the house? If that's true, please think about it. This is a huge deal, will potentially have an effect on your R/M, and the money still belongs to both of you.
I think talking about that could be a big deal; maybe email is the way to go there? She's going to freak out, I bet, so give her a chance to gather her thoughts.
Sorry about the potential bidding war. I'm sure it'll work out for the best. And taking action is still taking action, whether you get this place or the next.
