Help is my new guinea pig being bullied

[Ilovemyguineapigs21]

So i recently just got a new guinea pig that is still 6 weeks old and when i introduced them (outside of their cage of course) i thought they were protecting her because they were standing beside her and i thought of that because of Little Adventure’s video that said baby/young guinea pigs will be protected by the older ones.
However, I made a mistake of not changing the cage at all such as the fleece since I thought they were gonna be docile to her. But I was wrong and the older ones sometimes nips at her and at night she would squeak really loud and i dont know what theyre doing to her and i feel really bad what should i do.

 

[Piggies&buns]

Nipping can be a well judged thing, not fighting. The squeaking is possibly submission squealing which is a good thing and not necessarily a sign of a problem. If she submits to the others being higher in the hierarchy then there isn’t a problem.
However, a bit more information may help us if you are concerned. below are some guides which may help you

Bonds In Trouble
Sows: Behaviour and female health problems (including ovarian cysts)