OP, it's your friend so you will know if you have to do it, but if you have the slightest hint that she could, in a few months, turn back on you and twist what you said I'd also send a mail to have a paper trail, something reiterating "sorry I will not be able to do this, don't forget to inform Cici.. etc.."
And while I was typing the 'don't forget to inform Cici' it just occurred to me that your friend could ask Cici if she has some professionals to recommend, she probably has worked with a few already and they would know the place already.