How to get someone you care about to workout and eat healthy

My mom is overweight and is considered obese. She works 4 12 hour long days and 1 8 hour day and is very  exhausted  when she gets home. On the weekends she just sits on the couch and relaxes.. I try to get her to exercise even if it's to just go out for a walk. Or to have her track her food and eat a bit healthier. She wants no part of it. She realizes she's overweight and knows that she needs to change it but is to "lazy".  What can I try to do besides educate her about the importance of eating healthy and exercising ?