If she has surrendered the property to you (given you keys) then her being in the property is trespassing.

The tenant did surrender their keys to me also.  

But when we surrender to allow Higher Power to do the work through us, nothing is impossible.

This year, 8,218 more have been filed.Some mornings it's not unusual to see dozens of forlorn residents standing outside the doors of the downtown federal building, waiting to formally surrender their property.''

This means that he is surrendering the home, but the personal deficiency judgment would be wiped out.

We are not fighting inflation...we are surrendering to it. 

Census BureauDriver's License Surrenders to Nevada by State for 2018This shows which states people are moving from.Source: UNLV CBERFastest Job Growth in the NationSource: U.S.

And I'm required to keep the journal under my control unless asked to surrender it by a police officer or the secretary of state.

It could be as simple as a financing, inspection, or feasibility study contingency, or you could just limit any recovery for actions in breach to the value of your earnest money deposit, meaning you would surrender that deposit if you back out.That being said, I would encourage you to position yourself to make the deal work before putting a house under contract.  

I surrendered something that I value more highly than just about anything else: My mobility and freedom.