Agreed. There are purple/pink varieties too which are pretty planted next to the white ones. FataMorgana

We can probably tell you the genus, possibly the species or hybrid, with a good photo. The best angle is not straight above or directly at the side, but halfway in between. Feel along the edges of the leaves. Do you feel spines? If not, it is probably a Guzmania or Vriesea or possibly a Tillandsia. Send the photo and tell us about the spines - I'll give it my best shot!

Well my best guess is Stachys byzantina which has a common name of "Lamb's ears" or "Lamb's tongue". It is a groundcover, a perennial, with silvery grey leaves which have a woolly, velvet feel. You should be able to find it in a nursery or the garden section of, say, Bunnings, where it is often sold as a 6-pack perennial. If I'm wrong, it's such a charming little plant she'll probably enjoy it anyway and love you more for your efforts. Here is a link that might be useful: lambs ears

This looks like a form of Salvia nemerosa like May Night or East Friesland.