Toddlers up to age 3 generally need from 10 to 14 hours per day (just like adults some need more than others). It sounds like your DD is getting around 10 - 11 hours a day which is probably enough for her.

It's tricky to know what to do about the day sleep at this age. My DS is 2 1/2 and starting to drop his day sleep. When he has it, he can sleep for up to 3 hours, but at least every second day now he just won't sleep. I would like him to keep having the sleep for as long as he can, but I think our days are numbererd. But even if he doesn't sleep, he has to have "quiet time" in his room. I am not sure what you should do in your case, I think your DD needs less sleep than my DS, but my gut feeling is that while she will sleep during the day you probably shouldn't stop it.

Good luck with it all.