To me, the fact that she turned her shoulder back on you means she is brewing. I get the impression that she still loves you. If she hates you, then the hatred would have turned into actual actions already. e.g. cheating on her side or divorce on her side or other.
Is she the kind of person to normally be affectionate? The thing with this kind of situation is that, if you push her, she may blow up at you and then it will go from resentment towards hatred. Or one of you will break down, and then it won't be rosy any more.
Why do you not ask her about how she is feeling ? Is she still mad that you went out to the bars and came back late ? Each time you have a problem, resolve it, and nip it in the bud, and you continue to make this kind of effort to reassure one another. You cannot not respect her wishes as well. If you need to go out, then can you not come back much earlier for example ? Or do not drink, but definitely give or buy your clients drink.
You definitely need to figure this one out. Cos you're a married man, and must you drink ? You got to ask yourself if you want this kind of work life balance. Can't someone else from the office replace you ? You have to remember that you are a newly married man, (less than 5 years, is that right ?) and you are just a new father as well. Most men I know in my industry (IT) would not take up these kind of options at this stage of their career, but they do be more mobile later on. Only if the salary is worth it and it increases accordingly.
You need to ask her directly if she has forgiven you yet, and if there is anything that you can do, then what are her suggestions. What you have written above is based on our assumption. You wrote "she knows" this is what it takes for a new business. There is a difference between knowing, to that of wanting and approving of what you are doing. Maybe she never expected you to come home drunk. This is always a big no no in relationships. She has to worry about you and whether you also got home safely as well. On top of worrying about the baby too.
If two people resent each other, then one of you need to own up to the part that you feel and think that you did was wrong, before the other party owns up their part too and slowly open the dialogue too, and make changes and MEAN it. Do not deliver promises that you cannot keep. Cos if you do not build on the trust then you may as well throw out the relationship. If you need to be out late, always check with her, and if she is okay, or if she needs to stay up or whatever etc.