Mark I am probably the least experienced person on this site but I will say this, women view secrets as lies regardless of intent so I would tell her before she finds out through other channels. It is important to let her that you found a job in her town and you wanted her to know so it would not be a surprise, awkward and that so she does not think that you are being deceitful. One thing I do know having 4 sisters is women can take a lot of mistakes from men, especially men they are in love with but that is with the condition that they trust you. I am not sure this helps but it is definitely what I would do. Tell her. You don't need to make a big production out of it but let her know.
