Andy Burns wrote on 19/09/2020 6:06 PM:
Daniel65 wrote:

Does anyone here have any suggestions as to what she could try, please??

I know zero about facebook, but all other video/chat systems seem to
have an option to check their own mic/camera/speaker settings without
joining a conference ...

My sister can see and hear the other participants, but I'll pass this on.

Tks!
--
Daniel