When my daughter is around 1 year old, she had sleep from 8:00pm to 7:00am and she also has a nap from 1:00pm --4:00pm. She needs it and she has 97% heighter than the average kid.
Now she (2 years old) still has sleep+ nap around 12 hours.
Don't be worried about it. Just let her decide her sleep.
I started to cut off night feedings for my daughter at around 6 month (when I believe she was ready). It took 3 nights. Then she started teething, which totally interrupted my plan. Now at almost 7 month, she has two teeth and sleeps through nights. Personally, i think it has been successful so far. But if she is teething or sick, that could change the whole night routine.