No idea on the day care. I never had to deal with that thankfully.
You really should ask your lawyer on it.
Maybe you could deal with it based on her sending you the expense, kind of like medicals?
She sends you the expense, the proof and you pay your %. That would be my humble thought.
As for your bonuses, if they are anything like mine, you'll want to figure a way to pay only a percentage of what you receive. I've had some good years and some not so good years. My income can vary pretty wildly. It sounds like maybe you are the same.
Only thing, I can think of, however, is if your base salary is really low? I don't think you are going to be able to claim a $25k/year salary, if you usually are making closer to say $100k/year, you know what I mean?
I was already high end of the charts for child support, so it was not an issue. Hopefully your base salary is enough that they believe you shouldn't be earning more. My lawyer warned me about that also.
Overall, however, if she's taking you to court, all you can do is bring all your information, and your lawyer of course:) and hope for the best!