IR, I had a bad feeling about the school thing. So sorry. I have to agree with City. If you just cave on this, she's going to feel empowered and keep coming back. Speak to your L about plugging the holes or you'll end up with nothing. You are going to have a future and you can't be penniless. Also, you're going to need money to spend on your D. Not just give to her mother to spend for you. Typically, time equals money. Go for more time with D. The temp support was based on her reports of your income. The actual support should be based on you true income. Make sure your L has an accurate view of your income.
And, why can't your L demand that she find something else. An IT manager can find something better than a front desk position. It feels like she's just using this to lower her income while cleaning you out. Then, suddenly after it's over she'll find a better opportunity.
