Have you ever or do you now have access to that account???
Is this one of those situations where your money is our money but her money has always been HER money???
I'm also wondering why she voluntarily signed paperwork to remove her name from joint accounts but now complains about not having access to them and wants to refer to the as OUR accounts???
Maybe you should open a separate account. A NEW account that your future paychecks will go into and MOST of all the savings would go into...then you can give her the password to the old joint account she likes to call OUR account to allow her to pay some MARITAL bills with it while NOT handing her the keys to all your money (todays $ and future $).
By the way, until you are SERVED with a divorce petition there is no rule against you spending whatever family or marital money you want on whatever you want.
Withdraw some cash and buy some new clothes, stock up your pantry and freezer with some staple foods and non-perishable items and maybe even buy a few gift cards, ostensibly to give away as gifts later on to other people.
You have changed the locks to the house??? On that line of thinking, you could pay a contractor friend or relative some cash in advance to get a couple projects done around the house.
If you divorce, you'd only have to split the marital assets that remain. Once the divorce is filed, the petition will include standing orders that neither party is to dissipate or waste the marital estate. Until then either one of you can do whatever you want with your money.
Your wife has likely had a big head start on setting herself up nicely with "OUR JOINT" money and now she wants to split the remaining money 50/50. You should look things over a bit and consider some quick small defensible actions that could balance the scales a bit if you can.
The internet is 90% complaining and entitlement and I hate it because I deserve better!