Just a bit unsure as this is unknown territory. DD1 has been to friends' houses without me before, but it's always been to houses we've visited together first. She's been at nursery with this girl for a year; they live nearby; I've met the mum, chatted once or twice and she seems really nice; don't know the nanny, but she seems fine. Nanny has said she'll take DD1 back to the house with her straight after nursery, then I can come to pick her up. TBH I'd prefer to go with her the first time but I'm sure it'll be fine ... If I did decide I was uncomfortable with it I'm not sure what I'd say.
Not sure what I'm worried about really but I think I always imagined DD1 would go and play at the homes of people I knew, especially at this young age - is that unrealistic?