Blessing the drive-thru register

I went to my local Dunkin Donuts to buy a hot chocolate and some coffees for our family. The bill was $7 and I felt compelled by the lord to bless the girl in the Drive-Thru. I asked if they were allowed to take a tip and keep it for themselves or do they have to share in the tip cup? She said they were allowed to take tips and keep it so I gave her a $10 bill and a grace bomb. So I wasn't able to talk about the church I saw her stick the tip and the card in her back pocket and I am praying that she will be compelled to come to the site and check it out. I just was able to say Merry Christmas have a great day.