Stress due to work and relationship.

It is great that you are a vigilant parent. Speak to your daughter and ask her about the difficulty she is experiencing at work. Find a solution for her with your own expertise. Speak to her about the difficulties that she is experiencing in her relationship. Spend time with her. Take her out. Seek professional help.

Visit a Clinical Psychologist.

Make her do activities she enjoys.

Hello Friend, Good that you are seeking a help here. Appreciate your care to support your daughter in such suitations. Yes, she might be going through  stress and anxiety if there are job and relationship related issues. As mind and body are interlinked, such emotional disturbance can also affect her physical health and behavior. So it's better she goes through stress management plan immediately  on advice of a psychologists who can help to assess her current situation and symptoms to recommend a suitable and more practical solution. Ask her to call me directly or online through Practo for further detailed evaluation and suitable recommendation like self therapies, certain lifestyle changes, dietary changes and counseling support to handle emotional stress.. Be positive. She will be alright soon.

Please help her in taking a professional support. Fix an appointment with a psychological counselor either online or offline and encourage her to share her thoughts and feelings... That might give her a clarity to out of those issues.