Taking a break from running, she married Noah Talam (another Kenyan marathon runner) and the couple later had a daughter in 2011.

[9] After the birth of her daughter, Sumgong made a successful return in December 2011 at the Castellón Marathon, which she won in a personal best of 2:28:32.

[15] At the 2012 Boston Marathon, high-profile withdrawals and hot running conditions worked in her favour as the race came down to a sprint finish against Sharon Cherop, with Sumgong taking the runner-up spot two seconds behind.

However, she was cleared on appeal by the IAAF in September 2012, as the local injection which Sumgong had received was permitted under the governing body's rules.

[17] Cleared to race, Sumgong again finished behind Cherop at that year's Philadelphia Half Marathon, taking third place.

[18] Sumgong was much improved at the 2013 Rotterdam Marathon, as she won the race in a time of 2:23:27 – bettering her previous mark by over six minutes.

Her doping ban was eventually doubled to 8 years and re-started in January 2019 after it was deemed that she had lied and fabricated her medical records, ruling her out of international competitions until 2027.