Michigan's child support formula does not have a cliff. The more parenting time you have, the less support you pay. You (well, your boyfriend) made choices that left mom with the child more than 2/3 of the time, so you pay support. That's fair and appropriate.
Well, yes. You owe her money, she's entitled to receive the money you owe, and that's also 100% fair and appropriate.
If the tax refund was applied to arrears, and your current obligation includes an order to pay your share of costs for school trips and the like, she happens to be correct. And her request for the money you owe would once again be 100% fair and appropriate.
Child support is determined by formula. If you got a huge break in your ongoing support because you were unemployed, and you are now employed, it's only fair that you contribute a reasonable amount toward the support of your child. That amount is determined by formula.
No, it will not.
Leaving aside that you're not dad, but are dad's girlfriend.... why do you imagine that a parent's entering a new relationship would justify modifying custody, and why do you think that wouldn't apply to your own relationship?
Scared of what? Of
you?
Formula.
The court will look at your income, her income, the number of children subject to the order, the number of dependent children in your respective households, and the formula - and it will apply the formula to come up with a support amount. Whining that paying what the state deems a reasonable amount of support for your own child is a "money grab" will get you nowhere.
And you're not. He's irrelevant. Your support does not go up even one penny under the formula due to mom's having a new partner, any more than your own dating relationship affects what you owe. So are you happy now?
Whereas you are completely fixated upon... Hm.
That's great, but baby's gotta
eat.
The girlfriend won't be speaking.