Thanks jes_ON!
I actually submitted my BOWP a few days ago with my partner included on the application. The document checklist had slots for her, asking for pretty much all of the same information as myself - so it appears that she will have the same implied status since she has an open work permit application in process, even though she's not technically able to apply for a BOWP by herself (as a dependent on my EE application).
My primary concern/confusion was whether she would also still be able to work, or would have to leave her job. However I believe she can continue as she is technically applying 'for another type of work permit that is not an IEC work permit' on the link you posted, which would also have her on implied status. Or at least I hope!