Family members and friends were allowed to nominate instead of the housemates this week and Sara's mum's vote for Scott resulted in the history student breaking down in tears in the Diary Room.
Talking on spinoff show Bit on the Side about her vote for Scott, Sara's mum said: "I've been beating myself up since I came out the Diary Room.
"The thought process was... I solely put them up because they weren't up before. I like all the housemates, no-one has given Sara a hard time, so I found it incredibly hard.
"I'm absolutely devastated by Scott's reaction, I'm horrified that I have done that to him, I'm the rapscallion!"
Commenting on her daughter's progress in the show, she said: "I think it's fine, everything's going well. They're all doing absolutely fine in there."
Sara, Conor McIntyre and Luke Scrase are the three housemates taking part in this week's special White Room challenge. The winner will get a free pass to the final.
Big Brother continues daily on Channel 5.
[Big Brother Day 56 - Photo Gallery]
Copyright: Channel 5