I agree with what's been said already.
You must do whatever you can to protect your children born and unborn.
That toddler should not spend one more SECOND alone with your wife. If you are leaving him/her alone with her after knowing what she's capable of, you are also responsible for anything that happens.
Take a week off work, if you're covered by FMLA, take a leave of absence to tend to the safety of your children. Organize day care for that little toddler, talk IMMEDIATELY to a family law attorney about what to do regarding involuntary commitment to a detox/recovery program.
I understand you love her and want whats best for her, but right now, her wellbeing is not your priority. That neglected toddler who is at risk of major safety issues (and emotional, lets be frank) and that baby who isn't getting the opportunity to develop normally loaded with alcohol in his/her blood. If she had a .34 BAC, that can put people into a coma/death..imagine what damage it is causing in that little baby.
Please, do the next right thing for your children, who have absolutely no choice in this.