My apologies to the OP for adding my 2 cents to seomething I obviously know nothing about. Please disregard my advice and follow FFS's advice and let your daughters rear elbow fly wherever it wants. No artificial restricitons. Good luck to you on your journey.
Most of us have been there at one time or another. The key is learning/understanding the difference between an absolute and a preference. If you watch enough video, you will note that many hitters do in fact keep there hands in front of the elbow as you are suggesting. However you will also find some that do not, but are still very successful. Personally I do not spend much time thinking about either elbow.