@FLOTUS gives us a "w".

Tweet timestamp: 9:20 PM (EST) June 21, 2018

While the text count is Twitter's 260 character limit, the tweet could have been changed to include "w/ for with" to be a non error?

Text:

Today's visit to #Texas to spend time with children & thank the many hardworking individuals helping to care for them was very meaningful. Thank you to @SecAzar @HHSGOV for traveling w me today & the care you are giving these children in such a difficult time.