In a circumstance such as this, the rent you collect from your child may not have to be claimed as it may be considered to be more of a cost-sharing venture. If you have no expectation for profit and the amount she's paying is below the market value for a similar rental, you would likely be in a cost-sharing situation.
Here's a link for more information:
http://www.cra-arc.gc.ca/tx/bsnss/tpcs/rntl/fmv-eng.html