I don't think she sounds like a "petal path" sort of woman...and she might feel really pressured by that gesture...
My first thought was in her room...this sends a personal message right there...but then on the counter with a nice card would okay too...but in her room gives her opportunity to admire them without the eyes of the home upon her...where out in the open she might not get the opportunity to do so and may avoid doing so because she wants to remain indifferent in front of you...
