Personally I'd let the person know IF and only IF you are somewhat prepared that things could get weird and you might need to leave that job or this job isn't something that you plan on staying for the entire career.

Then I'd let her know because frankly her dating someone long distance might not be that serious at all. Now if this job is very important to you and you have no interest to leave it then I'd not risk it.

Right now I plan to eventually retire from my job/my life long career and no way I'd risk it.

But about 15-20 years ago I worked some temporary summer job and liked a guy there (who was also there for time being only) , I told him I was interested lol I guess I am not shy, he liked me as well. We tried to date but it wasn't developing into anything serious but we developed friendship and actually still occasionally keep in touch (we since both married etc)

So bottom line if this job isn't something you terribly need do tell her. Ask her for coffee perhaps. Don't necessarily profess love but suggest a little casual outing. If you value your job a lot, then don't. Good luck