How old is the puppy? If she were 12cweeks old or older and i were you, I would take her too. i do not know much about heart murmer's however others have said that their is a good chance she could outgrow it. I think this little pppy needs plenty of love and attention. Give her lots of good food too.
It looks to me that your heart is in the right place, and ready for a chalenge. Take her, and love her !
