What would you do??

Okay. So. My husbands nanny smokes. And she smokes in her house as well. You can always smell it in there and on her. Tonight is his cousins birthday and they wanted us to go out to eat. Then they said they are going to nannys for cake. I really don't want Amelia over there considering she just got home Tuesday from NICU for breathing issues at birth. I told her we could probably go eat but then need to get home bc our four year old needs to be in bed, which is the truth. Well come to find out nanny and papa aren't even going to eat bc they don't like Mexican. I don't want to hurt her feelings but I'm absolutely against going over there so I found an excuse to get out of it. Now they are blowing our phones up and I'm not talking anymore about it. I'll let my husband do it. I know she isn't going to quit smoking, but I feel like it's our #1 priority to keep poor kids safe and well.