We have no idea what thier feelings are...i wish we did. If you think that her main LL is acts of service, and she went through all of that for your birthday...id say that her actions spoke way louder than anything she could have possibly said to you yesterday or any overt reaction she could have made, you know what i mean?
The outward show of joy or whatever you were perhaps looking for, please consider why you were hoping to see that..why is thst important to you.
Maybe a good opportunity 5ro open up just a little...with a genuine thank you of some sort...small bouquet and a card saying thank you that her efforts for your birthday made you feel very special or something. No roses right now as they carry a connotation of romance. Maybe some spring flowers, lots of color lots of variety...maybe dont go flower route, but something.
Right now is not the best time to go over 5LL with her (i wish for you soon enough) but you have been together for decades and it is possible to make inferences on ranking them from her perspective...just to get a better vantage of how SHE feels loved or shows it.
I am really glad you went out with your work mates yesterday!
