[header] How to let a nanny go nicely [title] Sit down with the nanny in a quiet and calm environment, if possible. [step] Try to schedule this so both of you will have plenty of uninterrupted time to go through any important information. [title] Be upfront with the nanny. 
[step] Begin by explaining the circumstances as best you can. Explain the reasoning for the split in as much detail is needed.