Depression: How Partners Can Help

Many people actually get more fatigue when they are on an anti-depressant.  I would suggest that your fiance address her desire to sleep excessively with her medication provider.  Additionally, I would suggest that if you fiance is not in psychotherapy that she find a good CBT practitioner.  Many behavioral methods can help cope with symptoms of depression.  I understand that you are unsure of how to help your fiance.

You are in a difficult position.  If you push her, she may get angry or annoyed with you.  If you don't say/do anything, you may feel frustrated with her. Unfortunately, you have no control over the way your fiance copes with her symptoms.

Your best position is one of providing support and encouragement.  It may be helpful to encourage your fiance to be more active, but back-off if she indicates she will not do it.  You may also  look into getting info about depression from a book or even a support group.  It is helpful to be informed when you are supporting a loved one.