When to comfort a person and when to leave alone?

Has your mom seen a doctor or is she under a doctors care? What is your mom distressed about? You are a loving daughter, but at your age you don't have the experience to handle this alone. If she has a close friend or family member, go to that person and explain the situation, tell them you need help for your mom. For right now, just check on her and ask her if she needs anything, or what you can do for her. Now, as far as being a realist, unless a person has an illness that's terminal, there is a solution for every problem. Things can and do get better.