Have I developed a stalker?

For the past 4 days I’ve had this weird thing where this person who I don’t know seems to have decided to follow me on my commute and deliberately make me uncomfortable. This person is a short, fat woman with curly red hair who always wears grey tracksuits and has expensive headphones. She’s definitely mentally ill randomly screaming and cursing on the train or kicking the train.

I always walk to the end of the platform to get the quieter empty train carriages. The other day I’m waiting for the train to stop and I hear running, which is weird because the train isn’t going to leave and this dumpy woman darts in front of me so she can get on the train first.

I didn’t want to deal with her that morning so I turned around and just moved to another carriage and as I’m walking away she hurls jabs and taunts at me. It’s like she’s created this rivalry or one-upmanship that doesn’t exist.

Is this something I should go to the police about or is it just some harmless weirdo who I just have to deal with?