Motohashi was a member of
Team Aomori which represented Japan at two
Winter Olympics (2006 and 2010). She threw second stones for
Ayumi Onodera at the
2006 Winter Olympics, finishing 7th, and played second for
Moe Meguro at the
2010 Winter Olympics, finishing 8th. She skipped the Japan team at the
2002 World Junior Curling Championships, finishing last. She has also played for Japan at five
World Curling Championships: 2004 (7th), 2005 (9th), 2007 (9th), 2008 (4th) & 2010 (11th). After playing for the Meguro rink from 2007 to 2010, Motohashi began skipping her own team. She has yet to represent Japan internationally as a skip on the senior level. On the
World Curling Tour, Motohashi won the 2007
Meyers Norris Penny Charity Classic and the 2009
Twin Anchors Invitational while playing for Meguro, and later skipped her own rink to win the 2014
Avonair Cash Spiel. Founded own rink "
Loco Solare", a.k.a. "LS Kitami" in her hometown Tokoro, Kitami in Aug. 2010. The team members are all local members but achieved international success as the 2nd place in the 2016 World Women's Curling Championship in Swift Current. Motohashi was part of the Japanese team that won the 2018 Olympics
women curling bronze medal. In June 2018, Motohashi announced that she would rest for a while from a top curling player and concentrate on training young players. In 2021, she took over the Miki Hayashi rink as their skip. ==Personal life==