Hello CrazGecko, and a warm welcome to the forums.
I tend to agree with you that these apologies could be when she was in her previous relationship, a safety guide that seems to protect her from any ramifications or harm that she may have endured, and that must have been very frightening for her.
There maybe different reasons why she is doing this, although I'm not a qualified psych. but can relate to this happening, and it could be for sympathy, to keep the peace but too much can be a lacking in confidence.
Other words you could teach her to say other than what a counsellor could get her to understand what she is saying are, is to try and explain what she means.
Other encouraging, and I say this as trying to help her, is not to be upset by what happens between two other people, it's between them, the list could go on, but a professional counsellor will know the correct technique.
Hope to hear back from you.