If you are involved in any kind of Worker's Comp. or disability case then yes, there could very well be someone out there spying on you. They do this because there is so much fraud going on in the system. That being said, I would absolutely call the police on them. I don't care who they are. If someone is on your street that should not be there, call! Those people are so obvious. And creepy.
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I also suggest calling the police while she is sitting there. Could it be possible she is picking up someone? or is she always alone? Maybe you or a neighbor could take a pic of her, her car & license number, or at least write down her license number, car make & model.

I can tell you all another reason.. Since Amzel said something in regards to identity.. I have been a victim of tax fraud identity theft for 3 times since 2013... They had my ss number how or who I have no clue. I just received the fake returns this past week.. Talk about bullshit.. It has happened. It took IRS 4 years almost 5 now to inform me ... Why?? I was claiming my disability check.. Weird. Very.. I am filing suit against them. Because of not notifying me sooner.. Not only this...... But I'm also part of the EQUIFAX. Theft.. So my identity is now for anyone .to see... Invasion very much so... That it's very hard to believe I'm the real Carly now... Trust issues cause stress in return your pain goes through the roof... Do some research please.. To find out if you have been a victim... Peace to each of you.. 💘 to all.

I'd either approach her or call the police.

I would call the police. This also happened to my friend when filing for disability. However, it could be a totally different reason she is there.