If you have the exact arrival time and departure in their daily diary then that is all you need, you have the evidence, don't start making it up it it will be obvious.
Make sure you have all your risk assessments in place, these are very important.
Make sure you know current guidelines for safeguarding children in your area and where you have to report any concerns.
Have all your paperwork ready and laid out for the inspector, it saves time and questions.(best advice I was given)
Go on the childmindinghelp forum there is loads of fab advice.
Don't panic, what you haven't got written down if you can tell the inspector what you do and how it works for you then that will be ok, it doesn't all have to be written down. If you observe the children I expect you have written it in the diaries, all you have to show is how you use this to plan the next steps for the children.Tell her how you are beginning to use the development matters statements in the practise guidance to see the current development, thats the sort of thing she wants to hear.Write yourself a few notes. Have a look through the eyfs notes.
Have a few key words ready to say from the eyfs guidance, show how you use the document or if you don't use it much tell her how you are learning by attending training etc.
Go on the ofsted website and read some recent reports it will tell you why people are being marked down it will also show you what they are looking for.
Its too late to panic now, just chill and show how capable you are, act confident even if you're crapping yourself inside, Good luck xxx