I've never really done it before - this will only be his second Christmas. However, I never really did the "third-party" gift thing for her (i.e. - gift from dog, gift from son), and I know it would be something she would like (well, if we were under "normal" circumstances anyway). I don't think I gave her a mother's day gift from our son - now I DID give her a mother's day gift - it just wasn't from our son.
Again, I just wouldn't want this to be seen as a "pursuing" behavior at all. Rather, a 180 since it was something she wanted that I never did. Tough call on this one. Granted, it would not be anything lavish by ANY stretch of the imagination - just a nice gesture or token.