DD who is 2 is the same atm. She talks in her sleep and has conversations as well. She also have night terrors - she had one last night and took me a while to get her back to sleep.
When she is like that I sit with her in the lounge with no lights on and she snuggles into me and will drift off to sleep and then I put her back in her cot and there she stays till morning. Have you tried that if she wakes??