By the time she went back to mountain biking after the Commonwealth Games to defend her national title, Lynch had already missed the first two of the six rounds. As the four best results counted towards the title, there was no room for error. Lynch was in top form, won the remaining four national series races, and retained her title. With this accomplished, Braggins and Lynch travelled to the United States to prepare for the inaugural UCI Mountain Bike World Championships in 1990; prior to this, there were two separate events run by NORBA in the US, and by Grundig in Europe. At the final NORBA race, Lynch crashed badly. She took a couple of Aspirin, unaware that she was allergic to the drug. Just before the UCI World Championship race, Lynch needed hospital treatment for internal bleeding caused by her pain medication. She still competed, coming a "disappointing" tenth place in the cross country race after having hoped for a higher finish.