This is not ok. If you are otherwise happy with her, set out clearly the things you want her to do with your baby. However, it sounds to me like she is putting herself first. perhaps bahaving as she would with her own children, i.e. hanging out with her family, rather than doing what a professional nanny would do, i.e. take the baby to places with other nannies and babies. to the park for fresh air, to the library, etc. Good luck.

It boggles my mind that you think this is acceptable.

Unacceptable unless you okay it. I would have been pissed. I would never take my charges to my home without prior permission. I think it's a fire able offense.

I have to agree with ones saying this
should not be done. Suppose the child
is left with one of her relatives and this
child gets molested God forbid! No, absolutely
not!

When I was in a Nanny share family a had me taking their kids to school in the a.m. afterwards family b knew that I would go to the gym to w.o. then I'd meet her at her office to get my charges. She knew we went back to my house daily for me to shower and change. The kids watched a film and had a snack then we got on with our day. But she knew and agreed. The only thing is it backfired. Once mb saw the inside of my place and deemed it clean and appropriate she started trying to bring them to my place all of the time lol

Definitely not ok. You don't even know for sure who is watching your children while there. It's not entirely impossible that nanny leaves them with her family and goes to do something else - errands or job interviews.