How can I help my autistic partner when she is dysregulated?

Hello folks - my partner will become overstimulated somewhat easily and it affects her a ton. I want to be as helpful as I can, but I also don't want to add to anything when she's going through it. I've always had a very easy time regulating my emotions so it's difficult for me to relate. Is there anything that I can work on doing other than just being a calming presence for her? Thanks in advance.