Hi,
It is acceptable that you submit your application now, and she can submit hers later. However, it is very important to note that you must report her as your spouse (non-accompany) on your application. Otherwise, you will not be able to sponsor her later as your spouse/family member.
Willy Cheng, CCIC
ChengCosgrove Immigration Services
220 Duncan Mill Rd.
Suite 605
Toronto, ON M3B 3J5
(416) 879-8236
willy@chengcosgrove.comhttp://www.chengcosgrove.com