Multi user question

This may be obvious, but I’m new to WP. Anyway, is there an easy way on my site to have 2 separate blog pages with WP, so when my partner logs in, she can enter a blog that appears on a separate page, rather than have her blogs interspersed with mine?
The only way my tiny mind can see is to have a second install of WP in a separate folder, but this seems rather inelegant. Is there a way one of the php files can be modified to allow 2 separate blog pages, one for “admin” and one for “user”?
Apologies if this is in the docs or is regularly asked, I have searched but couldn’t find a clear answer.
llasher