Your partner is going through a bad time, and all she needs is your support.
You cannot - and should not try - to stop everything in her life that brings her down - depression (and that is what this is) is far more complex than that.
Try and get her to see her GP, and get some medication. It takes about two - three weeks for it to kick in and settle, so be patient.
In the mean time, be sensitive to her moods. If she wants to be alone, leave her alone, if she wants to talk, listen, if she wants to cry, hold her. If you cannot think of anythng to say, stay silent.
That is really the best thing for her - she needs your patience and suppport until she comes back to you - and she will - promise.
Let us know, please.