I would make the gift very much about the kids and not at all about you. Maybe they could wrap it - each doing a layer of wrap or something. Or make a bigger parcel and she undoes the layers and there's the little box inside. Hand or footprints from your little ones and so on. Plus cards from them. And very much stay in the background, so it is from them and they enjoy giving the gift.
She will know that you got it, but you got it from them to her...
JMHO :-)
T 13 M 7 Me 48 H 46 SS 15 BD 7.14 PA D final 5.16 (H filed)
We receive & we lose, and must try to achieve gratitude & embrace with whole hearts whatever of life that remains after the losses - Dubus