What is the best way to deal with Valentine's day for someone in an LTR? My current LTR has been going on for about 2 months with a girl who I had as a plate for 2 months before that.

I know shes already spent at least $100 on shit for me for Valentine's day so I'm definitely going to get her at least a box of chocolates or something but don't plan on spending too much money. She's a great girl, fits all my requirements for an LTR, and is always on her best behavior around me. Any suggestions on how to spend valentine's day and how to reward LTR's good behavior on Valentine's Day?