<human>: Hi everyone, first time poster! Hope I'm doing this right.

I have known my girlfriend for a few months now. For the most part, things are going really well. We are extremely compatible, and treat each other with a lot of respect and kindness. However due to a borderline abusive past relationship that she was in for three years, she has a few ongoing issues that are difficult for her. She is currently recieving professional help for her anxiety/depression, and is generally taking positive steps to overcome the way she feels, because she recognises herself that she is unhappy in some ways. As such, I don't feel like there is any need to decide whether I am 'in' or 'out', or look for methods to 'change' her (because I think that's a cruel way of thinking about people anyway). 

I'm mostly making this post to seek advice on ways I can help her when she's having bad days. These bad days often don't actually last the whole day - we can be having a good time together and then a switch seems to flip and she becomes tearful and afraid, and often the best way to resolve the situation is to give her time. She never blames me or implicates me as the cause of the feeling, as she recognises it as part of what she's going through inside. However, it sometimes becomes an issue when we are trying to build positive experiences together; I have occasionally felt disappointed or helpless when this happens, because I had no idea how she was feeling inside when I thought we were having fun. So basically, I've been wondering if anyone here has been in a similar situation before, either with romantic or non-romantic relationships, and could offer advice about how they supported someone when they were feeling like this?

Could you distill the essence of the text into 1-3 sentences?
<bot>: My new girlfriend sometimes has panic attacks or cries/becomes upset unexpectedly due to her anxiety and depression. What are some ways of supporting her when she feels like this to avoid it affecting our relationship?