I think Happy bday text is fine but not the good luck text. If she sent you one on your birthday I think it is fine to send a very benign note back. But, don't go out of your way for anything else. Just my two cents...
M 44 H 46 M 20yrs T 25 yrs S15 S12
ILYBINILWY 7/18/15 Move to MBR 9/8/15 Physical Separation 10/10/15 Suspect A 8/2015 Confirm A 12/27/15 D filed by H 2/2/16