This is the 8059th most frequent Polish word.
niesobia
The word "niesobia" does not exist in Polish. It may be a mistyped or misheard term.
The word 'niesie' here signifies the act of carrying by the subject, referring to her own benefit.
Ona często niesie sobie książki z biblioteki.
She often carries books from the library for herself.
In this usage, 'niesie' describes the physical action of carrying something to another location.
Niesie obiad do pokoju gościnnego.
She carries dinner to the guest room.
Here, 'niesie' metaphorically indicates bringing along an abstract concept, like an attitude.