Does your mom have friends that could visit and perhaps get her out of the house for a while? If they could get her interested in something or if she could look forward to an event of some type, perhaps she'd feel better.
Good luck w/the job, Bri. You're young and can handle a job and school. My son went to college full time and worked 3 part time jobs to pay his tuition so that he wouldn't be saddled w/student loan debt. At that time, my husband and I couldn't help him financially and he said that he's happy that we couldn't b/c it made him stronger. You sound like a tough cookie (in a good way) and I think a new job and your mom getting out of the house w/friends and activities would turn this whole situation around. Keep the faythe. :)