Hi Bobbi, yes tell her, make a joke of it. It could be she's put your name on her calendar a month or two early or mixed you up with someone else. This happened to me -a very old (she's in her nineties) friend I've know for over 40 years came to see me bottle of wine in hand and a card with a cheery 'Happy Birthday! sorry I'm late!". I just laughed and said something like " bit early my birthday is (insert date) but I'll take the wine! She just laughed and said she must make a note or the correct day on her calendar -and I wasn't getting another bottle or card for my real birthday lol!