DD not talking at nursery

[stressheaderic]

I'm a bit worried about my DD who is about to turn 2.
She is very chatty at home, can make 5 or 6 word sentences and tbh, doesn't stop talking and singing all day long, mainly with me, but also to her dad, and family and friends.
She goes to nursery 3 days a week and seems to like it, goes in willingly, greets staff affectionately, reluctant to leave, talks about her nursery friends at home - but she won't talk there. She will literally b chatting to me all the way there and along the corridor, then step in the room and be quiet.
The nursery staff say they hear her chatting away when playing but she won't ask them anything or answer them.
Is this ok, and will she start to talk, or should i be worried? She has been going to this nursery now for over a year and is very settled there. She has met all her other milestones and is a happy child generally.

ds1 was exactly like this. he also didn't/doesn't speak in other situations with new people. we focused on non-verbal things, like could he smile hello. he has since come out of his shell and is now one of the noisiest there, has been since just before he turned 3, though there are still situations outside nursery where he can't speak.

how is your dd in other situations?

With relatives who we don't see often, she is shy at first but does start to speak after a while.
She is wary of strangers and will shy away if kind-meaning folk speak to her - this is normal though isn't it.
We went to a new soft play this week and she went off playing without a backwards glance, getting involved with other children and having fun. She will happily be held by other family members and is not a clingy child at all. I work full time so she's always been minded by family members and nursery.