I don’t believe you are supposed to know that this woman is on HR’s watch list or what they talked to her about. If this HR gossips like this about her, I wonder what they say to others about you.

I’d advice to stop obsession with these women at work and if they are jealous or have feelings for you (why all of a sudden?). Not speaking to you at work doesn’t make her childish or is a sign of her having feelings for you. She isn’t obligated to speak to you even if it hurts your feelings. It’s a work place not social club

It seems like everyone in your work place has too much time on their hands to socialize and worry about romance and gossip (all including HR people!). Just focus on your work task. Don’t know what you do for a living but I barely have time to use the bathroom all day. I never had a job where I had that much or actually any time for other stuff at work.

I’d just focus on work task from now on