Just go and let her shoot from wherever you wish... as long as you are in line between the stakes and the target, so a miss doesn't cause a safety issue.

Just go and have fun. When my son was shooting at the trad shoots, my wife and I would walk him up past all the stakes and let him shoot from what distance he felt like. He had fun, and so did we. We wrote down his score, but we didn't turn in the card for competition.