16 weeks of age is still pretty young (inexperience, size, etc) for a pullet to be in close quarters with full-size adult hens. We don't usually fully integrate young birds with adults until they've reached about 6 months in age, but that's just us and it's worked well.
She may have been injured, unless you saw it all and can be sure that it was just pecking order messages. I'd look very closely at her head and neck area for injuries to be sure. If it was on the neck and there were injuries, the massages are likely going to cause more pain for her than any help they might give.
She may be in mild shock too if this was unexpected and violent from the pullet's perspective. A quiet place to rest for a day or two with food and water might be the way to go... Good luck with her!
She may have been injured, unless you saw it all and can be sure that it was just pecking order messages. I'd look very closely at her head and neck area for injuries to be sure. If it was on the neck and there were injuries, the massages are likely going to cause more pain for her than any help they might give.
She may be in mild shock too if this was unexpected and violent from the pullet's perspective. A quiet place to rest for a day or two with food and water might be the way to go... Good luck with her!