Try to do the move on a shoestring - waitress if needed, or find another substitute job at the town you're going to, and toss that job if you find something better. Try not to get into any debt.
Forget about "loyalty" - you're selling your abilities on the market.
As for your mom - she should be understanding because you already made a pretty big "gift" to your parents by moving back to support them. Now it should be your time to grow.