need help with a professional relationship and situation

For two years, I worked on a project and two professionals in the field supported me. Person A was incredibly vocal and public in her support. She even publicly endorsed me two years ago. Person B has always been consistently warm.
Recently I reached out to both with exciting personal news and suggested meeting up. Person B responded warmly. Person A left me on delivered — and this isn't the first sign. She's been cold at a recent event 7 months ago, ignores my posts, but actively watches all my social media stories.
Two questions:
There's a social event coming up where I'll likely see Person A. Should I go given the anxiety?
Person A and Person B are close longtime friends. When I meet Person B soon, should I bring up Person A's distance or leave it alone entirely? Worth noting I'm hoping to professionally work with Person B in the future.

It’s just that this has been impacting my mental health really badly and person b is the only person who could potentially give me clarity. But I definitely don’t want to make things awkward between us and loose this relationship too.

Any advice appreciated.