Nonjwspouse- sorry you are going through this. Sounds like a very stressful situation.
In answer to your question, yes I have noticed many witnesses are very adept at telling lies, half truths, and twisting data. Primarily though, I have seen it in defense of the org and it's nonsensical doctrines, not as much for personal gain.
Although, I also think because JW is not truly a faith based system, but rather a prescribed outwardly observable program that members follow, it lends itself to leading a double life and minor "fibbing" to keep up the facade. The goal is looking good to outsiders and other congregants, not improving oneself inside and developing good and authentic relationships.
I was a born-in JW, and this always bothered me. I noticed the incongruous behavior and had a hard time trusting JWs or feeling comfortable with them. My father was an adult convert with an outgoing personality and a strong distaste for deceit. My mother was an adult convert with quieter nature and a desire to keep the peace at all cost, to including fibbing for the sake of peace, the org, and other people's feelings. She does not lie to shield herself from consequences or for personal gain, always for the gain or reputation of someone else. She is intensely loyal to many people who do not reciprocate or have an agenda she is unaware of, which causes her to get into a pickle sometimes and then more lying or manipulating ensues to smooth it over. It's frustrating! And so much drama! Getting some distance from her and her associates has been a help to me gaining some peace.
As a side of unsolicited advice, have you considered separate finances with your husband? Doesn't have to be 50/50, but add up monthly expenses (including percent of debt pay off) and decide what percentage each of you will pay toward monthly household. The next step is key--pay the bills together. He needs the stop seeing you as the gatekeeper to the money, and start seeing the reality of what comes in and what goes out. If you each have remaining balances in your separate accounts, that belongs to each of you use without answering to the other. And keep the business finances completely separate from personal--no depositing business checks and withdrawing cash for personal use. All business income needs to be cycled back through the business and then pay yourselves a salary, hourly wage, or percentage of the profit (based on what the business can support and remain sustainable). So at the least, your household would have 4 separated financial systems : 1) the business, 2) yours 3) his 4) the household. At first it may seem like a shell game, but if you stick to it you can get the finances back on track. It can also help with honest communication because you are both dealing in hard data.
Probably you already know all this, and I do not intend to be condesceding, but these steps really helped a close family member who was in a similar predicament as you.
I wish you all the best and hope you can come to a decision that helps yourself and your daughter, and possibly the marriage if you deem it salvageable. Hugs..