So from what I gather, it seems like she ran a 5km race earlier this week, didn't get her PB and blamed the humidity of the British summer. A Redditor apparently called her out on this on a Reddit thread and commented that she always makes excuses for the runs which don't go her way. Liz Newcomer somehow worked out this girls identity and then made this slightly unhinged video where she tells this girl that she's looking forward to seeing her in Chicago:
The girl apparently apologised to Liz, and Liz then doxxed this girl and shared her identity and apology online with her followers. Messy!
Just shows what a narcissist she is, if she can't take the tiniest bit of criticism without referring to it as bullying.