Ending a room rental can differ from ending an ordinary rental
agreement, or it does not state the notice required, then the issue becomes what would two reasonable people in the place of you and your landlady have agreed to as to the notice period. Given that you pay your rent by the month, the reasonable notice period is proba- bly one month. (If your tenancy fell under the RTA, you would need to give at least 60 days’ notice to terminate the tenancy.)
Another question is whether your notice needs to end at the last day of a month of the tenancy. (The 60-day notice of termination period for an ordinary apartment does.) In your case the notice period may not need to end at the end of a month. For example, it may be that you can give notice on Feb. 10 to end your tenancy on March 10. If other tenants in the house have done that, then that is a possibility. However, to be safe, you should probably give your notice so that it takes effect at the end of a month of the tenancy.
The end of a month of the tenancy is not always the end of a calendar month, but it is usually the day of each month before your rent is due. If the agreement is that you pay your rent on the 15th of each month, then usually the 14th would be the last day of each month of ten- ancy.
You can give your notice by email. The notice should clearly state the date you are terminating, and to be safe that should be the last day of a month of the tenancy.
If your tenancy fell under the RTA, email notice would only be valid if the tenant can prove it reached the recipient. Normally a tenant should deliver written notice by hand or by mail or by another method set out in the RTA or the rules made under the RTA. An RTA notice needs to specify the rental unit for which the notice is given, to specify the date the notice is to take effect, and to be signed by the tenant or the tenant’s agent.