How can I get past my girlfriend ptsd?

Long story short.

During sex I triggered my girlfriend PTSD. She didn't make me aware until several days after, which I'm very proud of her for doing. We came up with a safe word to mitigate a situation like this from happening again. This issue now is I'm no longer comfortable to have sex. My girlfriend passiveness has been an issue our entire relationship, and this situation shows how passiveness can negatively effect a relationship. I no longer trust her to speak up if she's uncomfortable and I feel like she just has sex to please me. (This reasoning is not just from this situation but a accumulation of many). I'm not sure how to get past this or if it's something that can be resolved. I want a less passive partner but I don't want to change who my girlfriend is. Any opinions would be appreciated!

How can I get past my girlfriend ptsd?
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