I would suggest that you don't give a Mother's Day card for W based on HOW you feel about W. She isn't interested in hearing you or your feelings at all. That is introducing pressure and will most definitely come across as smothering to W.
Since your kids are very young, how about assisting them with homemade cards for W? That would go a looong way with W than just Hallmark cards that your kids cannot even read let alone understand them.
If I were you, I'd put away these cards for next year. This year, make it all about your kids and their love for Mommy.
