We have added a resistance band to the softball bag. My DD is attaching to the fence to do stretches at the field before practice (as a part of her warm-ups). Helps her get the extra stretches in she needs. Does your DD use them too?
Only at home and when she goes away, in the hotel. She has the "9 Stretches Every Pitcher/Catcher Should Do" routine before and after games and it helps a tremendous amount. Resistance only on off days.