Search Results: seeing boyfriend's ex

I went out with this girl I worked with a few times, but stopped seeing her primarily because I need more time to move in from my ex. But I soon found out she still lived with her ex boyfriend, so major red flag.
Anyway, she came and left from the workplace over the next year, and she tried to be friendly with me again once she broke up again with her ex. But I got back together with my ex.
After a while, my girlfriend and I were about to breakup as she was Mormon and about to do a mission and I wasn't Mormon. Then the co-worker messaged me wanting to have sex again before she left to move to a different state.
I refused because I still hoped my relationship would survive. But after a month we were done. I talked to the co-worker for a while until she started going to the Mormon church too, and tried to convert me.
It's been two years, and I since rejoined social media and over the past year, my coworker never came up. I used a different email and everything.

But a few days ago, she came up as a friend suggestion with no mutual friends or anything. She even was the first result if I typed in 'm'.
After a few days she wasn't there anymore. But I'm not blocked.

Does this mean she's now checking up on me?