Maybe you should let her help clean his enclosure? That way you would take him out and put him in a temp container, then you and she can clean the enclosure and dishes. Then she gets to pet him(with you making sure the head is away) before he goes back in.
Later once he's calm and you trust both him and her with more handling, you can take him out of the temp cage and hand him over for her to put him back in. (that way she's not the one reaching in and grabbing, which often startles the snake at first).
Double duty teaching that way. She learns how to care for the pet and how important it is to always clean and have clean dishes etc, and also that the reward for the work is the petting and fun part.