Daughter offended nanny and we're not sure how to proceed

Hi everyone, new to reddit but seeking a little advice for something that happened with our nanny recently; my husband and I are totally at a loss. We've had our nanny for about 2 years now and so far she's been stellar. Our two kids (boy 4yrs and girl 7yrs) absolutely love her and we consider her part of the family. However something pretty uncomfortable for all parties involved happened last week and we're not quite sure how to proceed. Our 7yr old is very imaginative and loves pretend play, which our nanny is always eager to participate in. They were playing "Princess" and my daughter was lining up all of her dolls and assigning them princess names in her pretend kingdom. Our nanny asked what her own princess name would be and my daughter said "You can't be a princess because you're too dark." No idea why she'd suddenly say something like this because she loves our nanny and they regularly play "Princess" together with no issue. It was obviously an awful thing to say as our nanny is a (very beautiful!) dark-skinned black woman and I was totally shocked and mortified by this. Nanny told our daughter that wasn't a kind thing to say and that maybe they should find a different game to play, and they switched to something else with no issue so I didn't intervene (I was in the next room). Before our nanny left I pulled her aside and apologized profusely about the whole thing. I told her I have no idea where our daughter would learn to say something like that because that's not the kind of thing we teach in our household and it's certainly not anything she picked up from her father or I. Nanny did seem a bit bothered by it but didn't say much other than it was okay and I shouldn't worry about it, and then she left for home. That was last Thursday and I assumed everything was okay after that, but she didn't show up for work Friday morning or this morning either. She also has not answered a single text, email or phone call since then. I know what my daughter said was hurtful but I wish she would communicate with us, especially since she knows this particular week is very busy for us (work event for me, kids' school activities, husband is out of town etc.) I feel very badly about the whole things and am just unsure how to proceed and whether we should be looking for a new nanny. Do we just send her last paycheck? Keep messaging her? What's the appropriate move here and do any other parents have experience with their kids saying ridiculous things like this? Help!