Hey there,
I can tell you that when I asked for my FBI clearance and state clearance, it took arround 2 week to get them , and I asked them while I live in lebanon. But I have lived for 9 month in the USA.
it is better to send a full application.
Good luck
PS. include the PC1 letter , and write an expedidte date,and mention that you need them for immigration on the outside envelop.
Our took 2 weeks. If she is in USA then put the date you want it. They are very good with it and send it in time. Never send incomplete application. Just have some patience