Nightmares

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6yo dd has had nightmares for over a year now. She isn't sure exactly what she is scared of or what happens in the dreams sometimes but she is very scared. Most nights she goes to sleep ok, but there are nights when it takes a good while. She's been in a decent bedtime routine since she was a baby, as have her sisters. But, recently it seems to have gotten worse & she is regularly joining me & DH in bed as she just can't settle again after a nightmare. I'm pregnant & due in June so we don't want her sleeping in with us then as we will be sleep deprived anyway.
She sleeps with a nightlight & lamp. She has a special teddy that she snuggles. We try talking her to sleep talking about nice things and encouraging good dreams but I'd love any other tips and ideas for settling her. We hate seeing her so upset and frightened and it's beginning to make her tired and grumpy the next day.
Help!

If you're worried about her being in bed with you when the baby comes, could you get DH to settle her in her own room instead? It might sound a bit babyish but my DD found those lullaby things on YouTube helped. The one she like just had pretty lights and lasted fir about an hour.

She refuses to even try to go back to sleep in her room some night, but I really like the lullaby idea. My mum had suggested music but she shares with her younger sister at the moment, but I suppose if younger DD isn't woken by the screaming and crying, she'd be fine with a little bit of soft music.
Thanks for the idea.