think like it is donating a quilt - you really never know the recipient there either - so in spite of by-gones, let it be exactly that - give your daughter what help she needs, but make her understand it is something "she wanted to overtake" so it is her baby - and make sure it is at her level so she can do most herself! you are only there for backup if needed..
Enjoy the time with your daughter - time is precious - and don't waste the time not spending it with her because of her wish to give your ex, her daddy- a home made gift from her.