Updating LoL Changes server to PBE

Hey,

a friend of mine on a Mac is having issues patching the game. She;s had to redownload the WHOLE client all over again every time there is a patch as every time it patches through the launcher it changes her sever to PBE despite previously being on OCE.

She is using Mac OS 10.11.3

Generally has a stable game regardless, is on the same internet connection as me, wired in and I have not had any issues with it.