Just wondering if she might have undiagnosed bipolar II. Just the depression and the wracking up expensive on credit cards could be a bit of an indicator of that. Bipolar II sufferers tend to want to end relationships when they are a bit manic, only to regret it later. Not sure if you noticed any hypomania (which again can be quite subtle).
Those with Bipolar II tend to be more on the depressed side with only hypomanic states, so not so obvious.
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