After reading a little about the maple syrup disease...it states that symptoms are noticed within a few weeks of life. Your daughter is 10 months old already and since she isn't in a coma and having seizures at this point in her life, then I'm sure she is fine in regards to the maple syrup disease...besides it being pretty rare, if there is nothing else wrong with her except that maple syrup smell, I wouldn't start freaking out about it.
However, there could be a diabetic problem possibly if it is unusually sweet....so keep an eye on it. Like does it smell also when her diapers are not to wet? Or more when they are full?
I have had three kids in diapers...all who are now out of diapers....and there is one thing I can say.....when the pee mixes with the materials in the diapers...it 100% DOES smell a little like maple syrup. This is something I have ALWAYS smelled and known happens. Especially if they are very full diapers.If you used pampers brand especially. Huggies a little too, but mostly pampers gave that smell.
I seriously wouldn't worry about it to much. I would be more worried if it was very foul smelling which could indicate a kidney infection or something....or dark in color as well.
You can ask the pediatrician if it would make you feel better, but honestly this is something I have smelled and even till this day as I nanny for a little boy....I have been dealing with it again.
Seriously- don't worry about it.