It takes time to heal from things that happened in the past all you can do it reassure, give her time and you just have to be good with communication and trying not to repeat things that went wrong in the past.(not saying u would) but just being consistent with how you treat her and give her time to adjust to something she’s probably not used to
I went through something similar to this. Dated someone for over a year who, in her relationship before me, was SA’d and she didn’t date for a while and when we started dating I got the hint from her friends to take it very slow (I also had a pretty good idea of what had happened before she ever told me; we were alr pretty good friends before dating). So that’s exactly what we did, we took it slow and I let her open up to me on her own time and schedule once she was comfortable…
With that being said, just be patient with her and show her you really like her and really care about her. And like others have said, make sure your words and actions line up. That’s a really big tell. She’ll eventually open up to you and trust you once she’s ready and comfortable and understands that you can be trusted after being hurt in the past. Trust me, it’s worth it in the long run bc once she opens up and trusts you she’s gonna be the greatest thing you’ve ever known