I think your mother gave you some sage advice. Quoting my post above - please bear in mind other people here give advice to try to save your marriage, my advice is to help you get divorced.
So long as your payments do not set precedent, and you DOCUMENT that this $$ was transferred and she agreed that this was part of the settlement, then there is no risk that I see. You are throwing a bone to the wolves while you continue on your path. The worst outcome in this, for everyone (well, except the lawyers!), is to make this acrimonious and both sides start swinging.
My one concern however is that while you may have not set a legal precedent, you have now set a precedent with your WW that you will pay up when she begs or threatens. So you have to assume she will come back for more, and likely escalate. This is why it is important that you get this process through as quickly as possible. Sounds like you are waiting for her to file? If so, I actually highly doubt she will file any time soon, especially as her only motivation for filing was to get $$, which she now thinks she can get without filing.
So here is my advice - 1. Dont wait for her to file. If there is no immediate action by her, then file yourself. You need to get the settlement signed and submitted before she gets her head out of her *** and reality dawns on her, which will happen when she is out of money.
2. When she comes back for more money - defer, delay, and blame the lawyer.
3. Keep documenting absolutely everything - especially custody, kids expenses, and payments or funds to her.
