Is your work permit still valid? When did it expire? If expired, you can no longer work. Have you had a work permit or applied inland while on a TRV.
If she is on mat leave, then ask employer for job letter that she is on mat leave with return date and if being topped off from employer she will have pay stubs. However this may not be enough as your SOWP is based on her PGWP and her working If she is not returning to employer, then she will need another job with paystubs/job letter for you to apply. You will have to wait until her mat leave is over and for her to return to work.