Display recent posts widget from blog located in a subfolder on the main blog (not multi-site)

I have a WP blog installed in a subfolder e.g. http://site.com/mysite.

I would like to display the recent posts from this blog on the WP blog in the root e.g. http://site.com

This is not currently setup as WP multi-site due to a conflict with a membership plugin.

How difficult would it be to add a new recent posts widget to pull posts from the subfolder blog?

Thanks for your help.