Letting Go. Detaching. Done Engaging.

[STH17]

although it is something we should do

I don't think this needs to be a "we" activity. And the way she dropped it on you certainly doesn't make it a "we" activity. Sounds like she wants you to run her errands for her. You are not her errand boy.

If she wants to give the teachers a present but you don't, she can do that herself and make it happen. If YOU want to give the teachers presents, you can get them something ($5 gift card?) but do it on your own and make it "From D4".