Yes you can use the I-864W. The I-765 is just so she can get the Social security # so as EAD card arrives since the approval of the I-485 can take some time. Just nice to have that sooner rather than later.
Here's the addresses of where to file according to where you live.
https://www.uscis.gov/uscis-lockbox-filing-locations-chart-for-certain-family-based-forms