sister's brain mets

My sister is back from her two-week vacation with family. She said that she felt quite good, especially being off chemo for the last 3 and a half weeks. When talking to her today, I noticed that her speech was slightly slowed and slurred...similar to the way it sounded prior to her brain mets diagnosis. She did tell me that again her vision has gotten worse. She finished tests a month ago trying to determine the cause of the her sight deterioration, but they said that there had been no changes to her existing lesions and no new ones that could cause this. She sees onc. on Thursday and I'm quite certain that he will schedule another scan. I'm going to be holding my breath because, though I try to remain positive, I fear the worse.Just when her liver and bones start to show improvement, we have to worry about the brain mets. Could this be a result of WBR (though she only had 5 treatments)? Oh my..what a roller coaster ride this is!!!