Washington state Deed of Trust?

My parents built a house in 1997, there were no mortgages and liens on it, as they paid cash for land and the house. Now I found out that last month they granted Deed of Trust to my sister. Does it mean that my sister can do whatever she wants to do with the property (sell etc). Or maybe they took out an equity loan on the house?
Any ideas would be appreciated. It is in the WA state.
Thank you

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