Should I text this girl Happy Valentines Day?

I have a whole ass gf and I think she low-key knows. I know we have a thing with each other, we made out once but she's playing a bit hard to get. I don't think she has a bf

Should I text her "happy valentines day, I hope you get the love you deserve". Or "happy valentines day, thinking of you" ..Would this send her off the rails?