She made her marathon debut at the 2006 Beijing Marathon but finished outside of the top ten women. She was fifth at the 2007 Nagoya Marathon, fourth at the Sapporo Half Marathon, then won that year's Kobe Half Marathon. At the beginning of 2008 she won the Miyazaki Women's Road Race and came third at the Osaka Ladies Marathon.
Mombi made her first international appearance for Kenya at the 2008 IAAF World Road Running Championships and her time of 1:11:11 hours for seventh place was enough to help the Kenyan women to the team silver medals. She was fifth at the 2009 Paris Marathon and represented her country in the women's marathon at the 2009 World Championships in Athletics, where she finished in twelfth place. She continued focusing on the marathon, coming eighth at the Tokyo Marathon and seventh in the Amsterdam Marathon in 2010.
- Nakamura, Ken (2007-11-23). Mombi wins Kobe Women’s Half Marathon. IAAF. Retrieved on 2011-10-20.
- Nakamura, Ken (2008-01-27). Britain’s Yamauchi wins Osaka Ladies Marathon in 2:25:10. IAAF. Retrieved on 2011-10-20.
- Nakamura, Ken (2008-01-06). Mombi wins Miyazaki Half Marathon. IAAF. Retrieved on 2011-10-20.
- Mumbi Muraga Julia. Marathon Info. Retrieved on 2011-10-20.
- Vazel, Pierre-Jean (2011-10-17). In debut, Tsega triumphs in Reims. IAAF. Retrieved on 2011-10-20.
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