How do I support my coworker who stutters?

How do I support my coworker who stutters? I recently made a friend at my local volunteering group who stutters. We often have to have Zoom calls in group settings because the group is remote. I feel so bad that she always gives people a heads up of her stutter. I haven't asked her what she prefers, but I also don't want to make her feel self conscious about her stutter. Would you be offended if your coworker asked. you? What are some things that your friends, family, or people have done where you felt really supported?