Transition to 1 nap

Is my 2yo ready to transit to 1 nap a day? After waking up for 3hrs, she starts to feel tired. I tried to bring her lunch forward by half an hour but by then she's too tired to eat. Now she will start to spit out her food. When she gets 2 nap a day, her bedtime would be around 10-11pm. That's really late for a toddler. I am also exhausted by then. What should I do to help her stay awake for longer period in the day?