i would probably avoid a plaque - but perhaps look in the poems for m/c and loss and see if something jumps out at you - put it in a card or something

i think, for me, as much as i know certain roses are planted for my angel babies, i don't think a plaque would be easy to deal with... if she wants to do it later, that's fine, but i think if you gave it to her, she may feel obliged to put it out even if she's not ready (if that makes sense) - with a poem, you can put it in a blank card and sign it "thinking of you" - without havng to outline why...