Un-like some others, I don't think she's being or acting excessive, sounds like a good mothers concern for health. Re-read the link you provided, especially this part in full;
Preventing Lead Exposure
Lead poisoning is 100% preventable. Workers and hobby shooters must be aware of the risks and potential adverse health effects of lead exposure. Proper ventilation, good housekeeping practices and basic personal hygiene practices will limit or eliminate the risk of lead exposure. The following simple steps are recommended to prevent lead exposure:
1. Use jacketed ammunition, preferably with non-lead primers, to reduce airborne lead in the range. Consult your range master or manager for more information.
7. Wash hands immediately after shooting, cleaning firearms, picking up spent casing pellets or reloading ammunition. Wash hands, forearms, and face before eating, drinking, smoking or contact with other people.
It really is about hygiene, washing your hands and useing a damp cloth to keep the loading area clean and orginized, just plain common sence.
Remember this, loading and shooting is fully under
your control, there are many things in our environment we have
no control over, the belching city bus, FOOD at the grocery store, mercury in fish from burning coal,,,,,,
A healthy consern and care is well advised, Wait till she old enough to go to Public School,,GADD'S! That'll scare ya ta death!