Erica is Taylor’s assistant although she has often been referred to as her tour manager (but she’s definitely an assistant). You can spot her somewhere around Taylor at pretty much any, even remotely, work-related thing or to put it this way - if Tree is around, there is 95% chance that Erica is too.
You might remember the #EricasExpressions hashtag that was somewhat popular during 1989 Tour, mostly because she has this facial expression which screams unimpressed and uninterested, like her soul is leaving her body… Like this:
However, she quickly became a darling of fans because she’s been Taylor’s ride or die for a very long time, and look - she smiles! (X)
…also, she seems to be as close to some of Taylor’s friends as Tree is, like this time Gigi made sure to give her a hug in midst of all that chaos:
You might also remember her from “Blank Space” music video BTS:
Anyways, her full name is Erica Worden and while I’m not sure for how long she’s been around (absolutely sure about Red era and 1989 era), I think I read somewhere (could have been some loft 89 story, someone that talked with her or some other blog post) that she’s been with Taylor pretty much since the beginning. So, let this be little tribute post to Erica and all her years of service and loyalty to Taylor.