Call a couple of realtors if you'll need to sell your house & get a guestimate of how much and how long on market on average......and duh, lightbulb moment, there you are, is this the reason your wife wants to quit her job? Since her GF hasn't done a real divorce yet, she may be an expert at nothing and clueless. I hope your wife (or the GF) doesn't think she'll be entitled to spousal support. I don't know what state you're in, but a number of states I've looked at don't even count the marriage time until after 5 years.
Anyways, the guesstimate from the realtors will give you something to go by if you're trying to do it sans attorneys. Bring in the attorneys & you'll have to hire an appraiser which generally comes in lower, whereas your local realtor knows how some popular features will bring in more dollars, etc. etc. Now if for some reason you need to stall the sale of your house, PM me & I'll tell you (or anyone else) how. I used to be a realtor.
I know this totally sucks & if you were on this site for a longer time or made it through a Dday or 2 or 3.....and then R'd, you'd know the lines she hands you & her attitude are BS. Straight out of Cheater's 101. As for the STD tests, yeah you need to. I watched a couple of seasons of the L Word & even tho it's an (un)reality show there was enough switching up that would convince me to take one to be on the safe side, just for herpes alone.
Another lightbulb moment..you know her best but 1) Think about keeping all your details about settlement close to your vest & then maybe hire a mediator & make it your "signing" day & things are done, over, kaput...so the GF is totally excluded from new incoming information & can't influence your wife.
or 2) If you can't avoid that, I'm wondering if she might be less swayed anytime something comes up that you think GF has influenced or inspired if you chide her & razz her a bit, such as "Gee, and (here you called me controlling)(I hope you never called me controlling) because you're really a puppet on a string now, eh?*chortle*" She's still young and may want to appear the strong, independent woman to you under these conditions & may pull away from her Dom GF...maybe.
Anyways, good job on the locks BUT is this okay in your state? I just have visions of you coming home to a busted door and your belongings missing, if not half, but instead in their entirety. I just hope she's so overwhelmed at this point, she won't fight for your sake. If you need another failsafe & stall, without legal papers, if you have to give her a key, well then install some outside the door locks rather than the doorknob locks. That should buy you more time. For what, I don't know, just throwing it out there hehe. Best wishes & thanks for the update!