I had a student with the same problem. Sometimes we just had to do a little editing, but
most times she just had to place what she could and then put the last finger on as soon as
she played the first finger. For solid chords, sometimes we took out one of the middle
notes, or re-voiced the chord. It’s not perfect, but it’s better than getting an injury. This
student became a superb harpist and musician, and nobody ever knew or cared how she
overcame the tiny hands.