So she bought an Amazon gift card. And then she created a wishlist of items she thought the mother might need, doing the research to find reputable brands, unique solutions to problems, "best mom gadgets", etc (such as the pacifier that you can put liquids into; it lets you get liquid medicines into the baby, like cough syrup, without stress). She sent the gift card, and the link to the wishlist with an explanation.
It was both a pragmatic and thoughtful approach, without the risk of buying something she already had, or didn't need or want.