As JuneRose says surely a bit of give and take isn't too much to ask. It costs nothing to wish someone a happy birthday and just to be pleasant surely.
I would tend to agree anna7. However the problem is her DIL is not fitting that "model" and probably never will because it is not her way in this context! Is that behaviour worth challenging as the OP doesn't like it, despite the potential consequences if arguments develop?
CountessFosco there are lots of positives in your situation. You see your family, you see your son, you enjoy your grandchildren. Your DIL does not try to stop any of that, she chooses not to engage too much which could be many for many reasons and in the end is her choice in the relationship.
I think you are best to quietly accept the situation as it is, continue to be polite and inclusive towards her. If you start to push for "a different relationship" that better fits the picture that you had of that relationship, you could lose some or all of what you already have that is positive. These things can escalate, can cause misunderstandings etc
Others have suggested gifts etc and that one can "catch more flies with honey" (like that phrase). This may help. However I think you need to keep in mind that it may not work; she may not want a deeper relationship; she may not respond in the way you want ...and ensure that if that is the case those gifts etc don't become yet another source of resentment for you. She may just not be interested!
Accept and enjoy what you have and leave her be, as your wise husband says