Um, it sounds like maybe its not a very common way to lose speech.
Im at a complete loss to know how to deal with this as there is no way to even guess at what she means - especially when its a whole phrase and isnt accompanied by any gestures. She sees my baffled look and can get quite cross. I can deal with her confabulations, but I dont know what to do when I have no idea what she thinks she has said. Should I just say gently "Im sorry - I didnt quite catch that"? What happens when there is no intelligible speech left, but she thinks she is talking to me?
My husband, if he's not in "when are we going home" mode, talks nonstop - lots of it makes no sense, but he seems to be telling a story of something he thinks he has done or something he thinks has happened, and if I laugh when he laughs and nod or say some other comment to show I'm listening, he is quite happy. It does sound like another language sometimes, and various care home staff have said to me " I didnt know your husband could speak Spanish/Italian etc"(which he can't!). I try to listen hard and if I pick up something I can understand, I comment on that.
Other times he can hold a proper conversation for a while but substitutes made up words sometimes. I ask what those words mean sometimes but he usually comes up with another made up word. Once he was looking a bit restless and said he wanted a table - from observing his restlessness, I asked if he wanted the toilet, and took him and that was what he wanted!
I sometimes say to him, sorry I cant understand what you've just said - can you speak a bit slower and other times I just try to initiate a conversation that means something and hope he carries on with that. Mostly, though, if he is happy telling his tale, I let him carry on