Thanks for all your reply.
It's a neighbourhood cc. I just asked the teacher again and she claimed that there'll be another teacher coming in to make it to 3 teachers. I'll monitor this for a while and see how.
Previously I visited learning vision, their ratio is 1:6. They split to small rooms with 5-6 toddlers in a room and 1 teacher. So, the interaction was quite good.
Maybe can't really compare with neighbourhood since their fee is already so much difference.
But if usual practice is having 1 group per room, then I'm looking to move my daughter to other cc.