If you can find evidence, or have an idea of where the mouse has been and the paths it tends to travel, disturb all around those areas daily (especially after dark), by vacuuming, mopping, scrubbing, moving items, etc.

Is it even a good idea to keep the tenant in the dark like this, or could it end up making things more complicated, maintaining a web of lies, etc...

She’s gone Dark on you.

This blocks natural lighting and makes the place look dark and uninviting.You need multiple angles of each room.

.- Shadowing another investor in my area- looking for openings in real estate management companies, or offering my helpOr..I could take my facilities job for the time being and save for an investment further down the roadI want to begin my investing as soon as I can but feel the opportunities that are available to me are a little limited due to my lack of experience and cash. 

It is inevitable that rates will rise and it is equally inevitable that banks will eventually eliminate their shadow inventory.

White or dark chocolate, as appropriate.

Shot in the dark, but I'd check their social media - one can learn a lot about a person on Facebook. 

And as of now it feels dark and very basement like.

Rodents always prefer to be in the shadows and this will force them to walk through a spot light if they want to get into the car (and they won't like it!).