I'm sorry she said that to you. :/ At 18 years old she may not fully appreciate that you need to be on disability. She just sees that she works, and you don't, and to her that may seem unfair. If she is working 40 hours a week and living at home, she should be contributing to rent/bills for sure. At 40 hours a week she can likely afford to rent her own place so that could be an option as well. Hopefully as she matures, she will understand that you are not choosing disability due to laziness, but rather necessity.