Does it make sense - probably not - to text her an apology first, now, soon, during her work day? I can apologize to her in person, of course, asking did you get my text message, but perhaps both together will have a larger effect?
It may well be too late, even with an apology, but in the karmic scheme of things I agree that it should be said.
Luke
M58, xW54 S22, D18 M 1984, D 2016 Living a new life.