it's true that when you move, you bring your anxious/depressed self with you.. I want to add though, what you can do about it:
depression is a feeling. Feelings are CREATED by our thoughts. So, if you think negative, self defeating thoughts, then your brain creates the feelings of depression, and feeling defeated. That's how feelings work. It's the only way they work. It's literally not possible to feel positive, when thinking negative.. The good news is that what we think about every waking moment is a CHOICE. She needs to DECIDE to focus on the positive - it takes some effort, but is surprisingly easy to accomplish. Negative thinking is a HABIT. Habits can be broken. Negative thoughts are like little brats that want all your attention, but you do not need to give it to them!
Step 1 - a negative thought comes to mind "my life sucks'
Step 2 - recognize that negative thought and reject it. "I will not think this way. This way of thinking solves nothing, changes nothing, fixes nothing. I refuse to do it!
Step 3 - CHANGE YOUR FOCUS - to something positive and self affirming "Like everyone else, I have problems. Thinking about those problems only keeps me stuck in the problem! I need to focus on the solution to the problem, I need to create a goal to overcome my problems, and then every day take small steps to reach that goal.. in this way, I stay positive, get unstuck, move forward (to where the goal is realized). By the way, this is biblical - the bible teaches that 'whatever is good... think on these things"..
Depression, and anxiety (which is just fear of the future/unknown) is all about how a person THINKS.. no pill is going to help with that..
Here's an exercise you might want to get her to try.. have her sit down with pen and paper (to slow the thought process) and write all the good things in her life - she has parents, she has a home, etc.. for 15 minutes straight - for 2 weeks. This exercise is powerful - it FORCES the brain to come up with positive things - all the while she is thinking positive! And soon, the brain will begin to 'play the game' even when she isn't doing the exercise.. what she's doing is creating a new way of thinking, a new HABIT.. the brain is literally creating new pathways - a positive one..