Maybe some answers here:
http://www.servicealberta.gov.ab.ca/...ds_Tenants.cfm
Alternatively:
Your downside is she will sue you. I would just prepare a letter yourself. Give her two weeks to pay you and make arrangements to mover her stuff or you will sell it.
After two weeks give her another letter telling her she did not comply with the initial demand and you now consider her stuff to be abandoned and you will be selling it to clear her debt and that you may pursue her for any shortfall.
Be careful because if you sell her stuff for $1000 she may be entitled to that. If that were to happen I would consider giving her the balance. You are not entitled to make a profit and it would look bad if she did sue you for the difference. A small risk but there nonetheless.
It is not worth the expense to hire a lawyer for what is a very small amount.