It sounds like she is only sleeping for one sleep cycle - which is exactly what my DD was doing at that age! PLEASE don't listen to people who say how long she should be sleeping for, every baby is different, and my DD for one never had 2 big sleeps, but she slept well at night.
I'll tell you what worked for us - we moved to 1 day sleep at around 12mths (started around 11mths, but still sometimes needed 2 depending on what time she woke up in the morning!) - her one sleep would be after an early lunch, so she would eat then be asleep by 1130am, then she sometimes sleeps for 3hrs! It meant that she would have some good awake time in the arvo and be ready for bed by 7pm. This routine is still working for us - she is now 18mths old.
HTH - all the best