Valentine's Day can be bad at first. Do something to distract yourself.
Will you have or be able to see your girls that day?
Doing for your D's is a really good idea. You can acknowledge it with her too.
I have kids that are older (D18 and D15) so they do their own thing.
I use to drag out the last V I got from my H just for laughs. It was a chocolate voodoo doll. Sounds morbid, but it always made me laugh and then I would go on about doing something enjoyable.