What i do not understand, is how to handle the finance: I used not to give her money, it was one of her complaints, so shall I be more generous now? Not to "buy" her, but to help rebuilding the trust.
It's like doing 180's. You don't do the opposite of everything, just 180 the things you need to change. You must use wisdom with the finances. Giving her more will not necessarily cause her to trust you. See what I mean? Do what you believe is fair to both sides.
Sticking to your word will gain her trust. When you don't try to stab in her in the back, or mistreat her for self gain, she'll know she can trust you. When she knows she can depend upon you (but not "use" you). In other words, if you tell her you will be somewhere on a certain date and time or that'll you do something.....she can depend on you following through with it. If you are in charge of something, she knows you'll do a great job. She doesn't have to worry about you squandering away your life's savings, or falling for some scam, or doing something irresponsible. She doesn't worry if you lie, b/c she can believe what you say. Trust comes in proving yourself over time.
It is not about what you feel should work in your M. It is about doing the work that gets the right results. Do what works!