If she is refusing to return to work full time w/ out a really good reason you can get the court to make a finding that she is voluntary unemployed and set her income at what it should be; i.e. the higher amount.

Is she taking care of the kids full-time?  how many kids? if the kids need daycare you have to pay a percentage amount based on your two respective incomes.  the formula is: add both parties income, then divide your income by the total amount which will yield a number from 0.00 to 1.  if it is 0.54 you would pay 54% of daycare and she 46%. get it?  so, the first determination the court has to make is what is her reasonable earning ability given her history. if there is not a huge difference between teh current income and what it has been over the last few years the court will normally just take the figures right off the average found in her last six months pay stubs.

there is a washington child support calculator on my website, make sure to put in only numbers etc. ie don't leave the boxes blank if her income is zero put 0.

another consideration is that the first support order you get will be good for 11 months until trial and can be reviewed or negotiated out after a better position or full time work is resumed.