How can I help my girlfriend with depression and anxiety?

Skizzz
We met back in May. It was a bumpy ride because we both have to travel a lot and we are currently long distance. We see each other every week though. We have been living together for the past 2 months due to the lockdown. While I work she's At home or doing her errands.
Here is the story. We both have emotional difficulties opening up etc due to past trauma, toxic relationships, missing parents and so on. It took a lot of time but eventually we both opened up. She told me she had difficulty comitting but she is comitted now.
The past month has been quite hard. She has frequent panic attacks when she is alone, she has this fear that if something healthwise happens she won't be able to make it out on her own. I always try to comfort her and do my best when I am around, but it is impossible to do that 24/7. I give her so much time love and attention and she tells me that nobody ever made her this happy, she was always used like trash. Issues Come mainly from emotionally and physically absent parents. Friends are away aswell but she will meet them soon, they live together.
She started therapy, but I am always worried. And this is my bad part. I always try to make things better and when things go like this I start to get extremely anxious as soon as I wake up. Maybe its empathy or my personal fears but I don't know what to do. My Last relationship ended with the girl cheating when things went like this and it destroyed me.
When I try to be there for her through texting or calling sometimes she closes off even more. Its like if Im not always present things will go bad. And I really don't know what to do so she feels better.
How can I help my girlfriend with depression and anxiety?
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