Another option (and I may be opening a can of worms) ... have you considered setting them on point? lots of times blocks and arrangements will look different when set different. You'll either need to discard one of the blocks, or make two more to make it work. And of course the setting triangles.
Hmmm ... since she likes the hearts so much how about making two more blocks, setting them on point in rows of 3 then 2 then 3 then 2 then 3. Place her heart block in the center, and make your setting triangles a quarter version of the heart block.